mirror of
https://github.com/jashkenas/coffeescript.git
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adding the complete underscore.coffee example to the docs
This commit is contained in:
Jeremy Ashkenas
parent
6e63a18f86
commit
ae603749be
8 changed files with 1295 additions and 590 deletions
1
Rakefile
1
Rakefile
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@ -37,6 +37,7 @@ task :doc do
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child = fork { exec "bin/coffee documentation/coffee/*.coffee -o documentation/js -w" }
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at_exit { Process.kill("INT", child) }
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Signal.trap("INT") { exit }
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# `uv -t idle -s coffeescript -h examples/underscore.coffee > documentation/underscore.html`
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loop do
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mtime = File.stat(source).mtime
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if !@mtime || mtime > @mtime
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@ -81,11 +81,11 @@
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<a href="#lexical_scope">Lexical Scoping and Variable Safety</a><br />
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<a href="#conditionals">Conditionals, Ternaries, and Conditional Assignment</a><br />
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<a href="#existence">The Existence Operator</a><br />
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<a href="#expressions">Everything is an Expression</a><br />
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<a href="#aliases">Aliases</a><br />
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<a href="#while">While Loops</a><br />
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<a href="#comprehensions">Comprehensions (Arrays, Objects, and Ranges)</a><br />
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<a href="#slice_splice">Array Slicing and Splicing with Ranges</a><br />
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<a href="#expressions">Everything is an Expression</a><br />
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<a href="#inheritance">Inheritance, and Calling Super from a Subclass</a><br />
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<a href="#embedded">Embedded JavaScript</a><br />
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<a href="#switch">Switch/When/Else</a><br />
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@ -101,6 +101,13 @@
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<p><i>CoffeeScript on the left, compiled JavaScript output on the right.</i></p>
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<%= code_for('overview', 'cubed_list') %>
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<p>
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For a longer CoffeeScript example, check out
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<a href="documentation/underscore.html">Underscore.coffee</a>, a port
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of <a href="http://documentcloud.github.com/underscore/">Underscore.js</a>
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to CoffeeScript, which, when compiled, passes the complete Underscore test suite.
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</p>
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<h2 id="installation">Installation and Usage</h2>
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@ -321,34 +328,6 @@ coffee --print app/scripts/*.coffee > concatenation.js</pre>
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</p>
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<%= code_for('existence') %>
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<p id="expressions">
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<b class="header">Everything is an Expression (at least, as much as possible)</b>
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You might have noticed how even though we don't add return statements
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to CoffeeScript functions, they nonetheless return their final value.
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The CoffeeScript compiler tries to make sure that all statements in the
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language can be used as expressions. Watch how the <tt>return</tt> gets
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pushed down into each possible branch of execution, in the function
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below.
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</p>
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<%= code_for('expressions', 'eldest') %>
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<p>
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Because variable declarations occur at the top of scope, assignment can
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be used within expressions, even for variables that haven't been seen before:
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</p>
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<%= code_for('expressions_assignment', 'six') %>
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<p>
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Things that would otherwise be statements in JavaScript, when used
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as part of an expression in CoffeeScript, are converted into expressions
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by wrapping them in a closure. This lets you do useful things, like assign
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the result of a comprehension to a variable:
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</p>
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<%= code_for('expressions_comprehension', 'globals') %>
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<p>
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As well as silly things, like passing a <b>try/catch</b> statement directly
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into a function call:
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</p>
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<%= code_for('expressions_try', true) %>
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<p id="aliases">
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<b class="header">Aliases</b>
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Because the <tt>==</tt> operator frequently causes undesirable coercion,
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@ -428,6 +407,34 @@ coffee --print app/scripts/*.coffee > concatenation.js</pre>
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array with new values (to splice it).
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</p>
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<%= code_for('splices', 'numbers') %>
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<p id="expressions">
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<b class="header">Everything is an Expression (at least, as much as possible)</b>
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You might have noticed how even though we don't add return statements
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to CoffeeScript functions, they nonetheless return their final value.
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The CoffeeScript compiler tries to make sure that all statements in the
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language can be used as expressions. Watch how the <tt>return</tt> gets
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pushed down into each possible branch of execution, in the function
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below.
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</p>
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<%= code_for('expressions', 'eldest') %>
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<p>
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Because variable declarations occur at the top of scope, assignment can
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be used within expressions, even for variables that haven't been seen before:
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</p>
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<%= code_for('expressions_assignment', 'six') %>
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<p>
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Things that would otherwise be statements in JavaScript, when used
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as part of an expression in CoffeeScript, are converted into expressions
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by wrapping them in a closure. This lets you do useful things, like assign
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the result of a comprehension to a variable:
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</p>
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<%= code_for('expressions_comprehension', 'globals') %>
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<p>
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As well as silly things, like passing a <b>try/catch</b> statement directly
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into a function call:
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</p>
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<%= code_for('expressions_try', true) %>
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<p id="inheritance">
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<b class="header">Inheritance, and Calling Super from a Subclass</b>
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612
documentation/underscore.html
Normal file
612
documentation/underscore.html
Normal file
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@ -0,0 +1,612 @@
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" lang="en">
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<head>
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<meta http-equiv="content-type" content="text/html; charset=iso-8859-1" />
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<link rel="stylesheet" type="text/css" media="screen,projection,print" href="css/idle.css" />
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<title>Underscore.coffee</title>
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<style type="text/css">
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body {
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margin: 0; padding: 0;
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}
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</style>
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</head>
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<body>
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<pre class="idle"><span class="line-numbers"> 1 </span>
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<span class="line-numbers"> 2 </span> <span class="Comment"><span class="Comment">#</span> Underscore.coffee</span>
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<span class="line-numbers"> 3 </span> <span class="Comment"><span class="Comment">#</span> (c) 2009 Jeremy Ashkenas, DocumentCloud Inc.</span>
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<span class="line-numbers"> 4 </span> <span class="Comment"><span class="Comment">#</span> Underscore is freely distributable under the terms of the MIT license.</span>
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<span class="line-numbers"> 5 </span> <span class="Comment"><span class="Comment">#</span> Portions of Underscore are inspired by or borrowed from Prototype.js,</span>
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<span class="line-numbers"> 6 </span> <span class="Comment"><span class="Comment">#</span> Oliver Steele's Functional, and John Resig's Micro-Templating.</span>
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<span class="line-numbers"> 7 </span> <span class="Comment"><span class="Comment">#</span> For all details and documentation:</span>
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<span class="line-numbers"> 8 </span> <span class="Comment"><span class="Comment">#</span> http://documentcloud.github.com/underscore/</span>
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<span class="line-numbers"> 9 </span>
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<span class="line-numbers"> 10 </span>
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<span class="line-numbers"> 11 </span> <span class="Comment"><span class="Comment">#</span> ------------------------- Baseline setup ---------------------------------</span>
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<span class="line-numbers"> 12 </span>
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<span class="line-numbers"> 13 </span> <span class="Comment"><span class="Comment">#</span> Establish the root object, "window" in the browser, or "global" on the server.</span>
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<span class="line-numbers"> 14 </span> root<span class="Keyword">:</span> <span class="Variable">this</span>
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<span class="line-numbers"> 15 </span>
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<span class="line-numbers"> 16 </span>
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<span class="line-numbers"> 17 </span> <span class="Comment"><span class="Comment">#</span> Save the previous value of the "_" variable.</span>
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<span class="line-numbers"> 18 </span> previousUnderscore<span class="Keyword">:</span> root._
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<span class="line-numbers"> 19 </span>
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<span class="line-numbers"> 20 </span>
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<span class="line-numbers"> 21 </span> <span class="Comment"><span class="Comment">#</span> If Underscore is called as a function, it returns a wrapped object that</span>
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<span class="line-numbers"> 22 </span> <span class="Comment"><span class="Comment">#</span> can be used OO-style. This wrapper holds altered versions of all the</span>
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<span class="line-numbers"> 23 </span> <span class="Comment"><span class="Comment">#</span> underscore functions. Wrapped objects may be chained.</span>
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<span class="line-numbers"> 24 </span> <span class="FunctionName">wrapper</span><span class="Keyword">:</span> <span class="FunctionArgument">obj</span> <span class="Storage">=></span>
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<span class="line-numbers"> 25 </span> <span class="Variable">this</span>._wrapped<span class="Keyword">:</span> obj
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<span class="line-numbers"> 26 </span> <span class="Variable">this</span>
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<span class="line-numbers"> 27 </span>
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<span class="line-numbers"> 28 </span>
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<span class="line-numbers"> 29 </span> <span class="Comment"><span class="Comment">#</span> Establish the object that gets thrown to break out of a loop iteration.</span>
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<span class="line-numbers"> 30 </span> breaker<span class="Keyword">:</span> <span class="Keyword">if</span> <span class="Keyword">typeof</span>(StopIteration) <span class="Keyword">is</span> <span class="String"><span class="String">'</span>undefined<span class="String">'</span></span> <span class="Keyword">then</span> <span class="String"><span class="String">'</span>__break__<span class="String">'</span></span> <span class="Keyword">else</span> StopIteration
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<span class="line-numbers"> 31 </span>
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<span class="line-numbers"> 32 </span>
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<span class="line-numbers"> 33 </span> <span class="Comment"><span class="Comment">#</span> Create a safe reference to the Underscore object for reference below.</span>
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<span class="line-numbers"> 34 </span> _<span class="Keyword">:</span> <span class="FunctionName">root._</span><span class="Keyword">:</span> <span class="FunctionArgument">obj</span> <span class="Storage">=></span> <span class="Keyword">new</span> <span class="TypeName">wrapper</span>(obj)
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<span class="line-numbers"> 35 </span>
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<span class="line-numbers"> 36 </span>
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<span class="line-numbers"> 37 </span> <span class="Comment"><span class="Comment">#</span> Export the Underscore object for CommonJS.</span>
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<span class="line-numbers"> 38 </span> <span class="Keyword">if</span> <span class="Keyword">typeof</span>(exports) <span class="Keyword">!</span><span class="Keyword">=</span> <span class="String"><span class="String">'</span>undefined<span class="String">'</span></span> <span class="Keyword">then</span> exports._<span class="Keyword">:</span> _
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<span class="line-numbers"> 39 </span>
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<span class="line-numbers"> 40 </span>
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<span class="line-numbers"> 41 </span> <span class="Comment"><span class="Comment">#</span> Create quick reference variables for speed access to core prototypes.</span>
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<span class="line-numbers"> 42 </span> slice<span class="Keyword">:</span> Array.prototype.slice
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<span class="line-numbers"> 43 </span> unshift<span class="Keyword">:</span> Array.prototype.unshift
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<span class="line-numbers"> 44 </span> toString<span class="Keyword">:</span> Object.prototype.toString
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<span class="line-numbers"> 45 </span> hasOwnProperty<span class="Keyword">:</span> Object.prototype.hasOwnProperty
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<span class="line-numbers"> 46 </span> propertyIsEnumerable<span class="Keyword">:</span> Object.prototype.propertyIsEnumerable
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<span class="line-numbers"> 47 </span>
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<span class="line-numbers"> 48 </span>
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<span class="line-numbers"> 49 </span> <span class="Comment"><span class="Comment">#</span> Current version.</span>
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<span class="line-numbers"> 50 </span> _.VERSION<span class="Keyword">:</span> <span class="String"><span class="String">'</span>0.5.3<span class="String">'</span></span>
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<span class="line-numbers"> 51 </span>
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<span class="line-numbers"> 52 </span>
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<span class="line-numbers"> 53 </span> <span class="Comment"><span class="Comment">#</span> ------------------------ Collection Functions: ---------------------------</span>
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<span class="line-numbers"> 54 </span>
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<span class="line-numbers"> 55 </span> <span class="Comment"><span class="Comment">#</span> The cornerstone, an each implementation.</span>
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<span class="line-numbers"> 56 </span> <span class="Comment"><span class="Comment">#</span> Handles objects implementing forEach, arrays, and raw objects.</span>
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<span class="line-numbers"> 57 </span> <span class="FunctionName">_.each</span><span class="Keyword">:</span> <span class="FunctionArgument">obj, iterator, context</span> <span class="Storage">=></span>
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<span class="line-numbers"> 58 </span> index<span class="Keyword">:</span> <span class="Number">0</span>
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<span class="line-numbers"> 59 </span> <span class="Keyword">try</span>
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<span class="line-numbers"> 60 </span> <span class="Keyword">return</span> obj.forEach(iterator, context) <span class="Keyword">if</span> obj.forEach
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<span class="line-numbers"> 61 </span> <span class="Keyword">if</span> _.isArray(obj) <span class="Keyword">or</span> _.isArguments(obj)
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<span class="line-numbers"> 62 </span> <span class="Keyword">return</span> iterator.call(context, obj[i], i, obj) <span class="Keyword">for</span> i <span class="Keyword">in</span> [<span class="Number">0</span>...obj.length]
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<span class="line-numbers"> 63 </span> iterator.call(context, val, key, obj) <span class="Keyword">for</span> val, key <span class="Keyword">in</span> obj
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<span class="line-numbers"> 64 </span> <span class="Keyword">catch</span> e
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<span class="line-numbers"> 65 </span> <span class="Keyword">throw</span> e <span class="Keyword">if</span> e <span class="Keyword">isnt</span> breaker
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<span class="line-numbers"> 66 </span> obj
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<span class="line-numbers"> 67 </span>
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<span class="line-numbers"> 68 </span>
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<span class="line-numbers"> 69 </span> <span class="Comment"><span class="Comment">#</span> Return the results of applying the iterator to each element. Use JavaScript</span>
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<span class="line-numbers"> 70 </span> <span class="Comment"><span class="Comment">#</span> 1.6's version of map, if possible.</span>
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<span class="line-numbers"> 71 </span> <span class="FunctionName">_.map</span><span class="Keyword">:</span> <span class="FunctionArgument">obj, iterator, context</span> <span class="Storage">=></span>
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<span class="line-numbers"> 72 </span> <span class="Keyword">return</span> obj.map(iterator, context) <span class="Keyword">if</span> (obj <span class="Keyword">and</span> _.isFunction(obj.map))
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<span class="line-numbers"> 73 </span> results<span class="Keyword">:</span> []
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<span class="line-numbers"> 74 </span> _.each(obj)<span class="FunctionArgument"> value, index, list </span><span class="Storage">=></span>
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<span class="line-numbers"> 75 </span> results.push(iterator.call(context, value, index, list))
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<span class="line-numbers"> 76 </span> results
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<span class="line-numbers"> 77 </span>
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<span class="line-numbers"> 78 </span>
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<span class="line-numbers"> 79 </span> <span class="Comment"><span class="Comment">#</span> Reduce builds up a single result from a list of values. Also known as</span>
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<span class="line-numbers"> 80 </span> <span class="Comment"><span class="Comment">#</span> inject, or foldl. Uses JavaScript 1.8's version of reduce, if possible.</span>
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<span class="line-numbers"> 81 </span> <span class="FunctionName">_.reduce</span><span class="Keyword">:</span> <span class="FunctionArgument">obj, memo, iterator, context</span> <span class="Storage">=></span>
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<span class="line-numbers"> 82 </span> <span class="Keyword">return</span> obj.reduce(_.bind(iterator, context), memo) <span class="Keyword">if</span> (obj <span class="Keyword">and</span> _.isFunction(obj.reduce))
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<span class="line-numbers"> 83 </span> _.each(obj)<span class="FunctionArgument"> value, index, list </span><span class="Storage">=></span>
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<span class="line-numbers"> 84 </span> memo<span class="Keyword">:</span> iterator.call(context, memo, value, index, list)
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<span class="line-numbers"> 85 </span> memo
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||||
<span class="line-numbers"> 86 </span>
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<span class="line-numbers"> 87 </span>
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<span class="line-numbers"> 88 </span> <span class="Comment"><span class="Comment">#</span> The right-associative version of reduce, also known as foldr. Uses</span>
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||||
<span class="line-numbers"> 89 </span> <span class="Comment"><span class="Comment">#</span> JavaScript 1.8's version of reduceRight, if available.</span>
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<span class="line-numbers"> 90 </span> <span class="FunctionName">_.reduceRight</span><span class="Keyword">:</span> <span class="FunctionArgument">obj, memo, iterator, context</span> <span class="Storage">=></span>
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<span class="line-numbers"> 91 </span> <span class="Keyword">return</span> obj.reduceRight(_.bind(iterator, context), memo) <span class="Keyword">if</span> (obj <span class="Keyword">and</span> _.isFunction(obj.reduceRight))
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<span class="line-numbers"> 92 </span> _.each(_.clone(_.toArray(obj)).reverse())<span class="FunctionArgument"> value, index </span><span class="Storage">=></span>
|
||||
<span class="line-numbers"> 93 </span> memo<span class="Keyword">:</span> iterator.call(context, memo, value, index, obj)
|
||||
<span class="line-numbers"> 94 </span> memo
|
||||
<span class="line-numbers"> 95 </span>
|
||||
<span class="line-numbers"> 96 </span>
|
||||
<span class="line-numbers"> 97 </span> <span class="Comment"><span class="Comment">#</span> Return the first value which passes a truth test.</span>
|
||||
<span class="line-numbers"> 98 </span> <span class="FunctionName">_.detect</span><span class="Keyword">:</span> <span class="FunctionArgument">obj, iterator, context</span> <span class="Storage">=></span>
|
||||
<span class="line-numbers"> 99 </span> result<span class="Keyword">:</span> <span class="BuiltInConstant">null</span>
|
||||
<span class="line-numbers"> 100 </span> _.each(obj)<span class="FunctionArgument"> value, index, list </span><span class="Storage">=></span>
|
||||
<span class="line-numbers"> 101 </span> <span class="Keyword">if</span> iterator.call(context, value, index, list)
|
||||
<span class="line-numbers"> 102 </span> result<span class="Keyword">:</span> value
|
||||
<span class="line-numbers"> 103 </span> _.breakLoop()
|
||||
<span class="line-numbers"> 104 </span> result
|
||||
<span class="line-numbers"> 105 </span>
|
||||
<span class="line-numbers"> 106 </span>
|
||||
<span class="line-numbers"> 107 </span> <span class="Comment"><span class="Comment">#</span> Return all the elements that pass a truth test. Use JavaScript 1.6's</span>
|
||||
<span class="line-numbers"> 108 </span> <span class="Comment"><span class="Comment">#</span> filter(), if it exists.</span>
|
||||
<span class="line-numbers"> 109 </span> <span class="FunctionName">_.select</span><span class="Keyword">:</span> <span class="FunctionArgument">obj, iterator, context</span> <span class="Storage">=></span>
|
||||
<span class="line-numbers"> 110 </span> <span class="Keyword">if</span> obj <span class="Keyword">and</span> _.isFunction(obj.filter) <span class="Keyword">then</span> <span class="Keyword">return</span> obj.filter(iterator, context)
|
||||
<span class="line-numbers"> 111 </span> results<span class="Keyword">:</span> []
|
||||
<span class="line-numbers"> 112 </span> _.each(obj)<span class="FunctionArgument"> value, index, list </span><span class="Storage">=></span>
|
||||
<span class="line-numbers"> 113 </span> results.push(value) <span class="Keyword">if</span> iterator.call(context, value, index, list)
|
||||
<span class="line-numbers"> 114 </span> results
|
||||
<span class="line-numbers"> 115 </span>
|
||||
<span class="line-numbers"> 116 </span>
|
||||
<span class="line-numbers"> 117 </span> <span class="Comment"><span class="Comment">#</span> Return all the elements for which a truth test fails.</span>
|
||||
<span class="line-numbers"> 118 </span> <span class="FunctionName">_.reject</span><span class="Keyword">:</span> <span class="FunctionArgument">obj, iterator, context</span> <span class="Storage">=></span>
|
||||
<span class="line-numbers"> 119 </span> results<span class="Keyword">:</span> []
|
||||
<span class="line-numbers"> 120 </span> _.each(obj)<span class="FunctionArgument"> value, index, list </span><span class="Storage">=></span>
|
||||
<span class="line-numbers"> 121 </span> results.push(value) <span class="Keyword">if</span> <span class="Keyword">not</span> iterator.call(context, value, index, list)
|
||||
<span class="line-numbers"> 122 </span> results
|
||||
<span class="line-numbers"> 123 </span>
|
||||
<span class="line-numbers"> 124 </span>
|
||||
<span class="line-numbers"> 125 </span> <span class="Comment"><span class="Comment">#</span> Determine whether all of the elements match a truth test. Delegate to</span>
|
||||
<span class="line-numbers"> 126 </span> <span class="Comment"><span class="Comment">#</span> JavaScript 1.6's every(), if it is present.</span>
|
||||
<span class="line-numbers"> 127 </span> <span class="FunctionName">_.all</span><span class="Keyword">:</span> <span class="FunctionArgument">obj, iterator, context</span> <span class="Storage">=></span>
|
||||
<span class="line-numbers"> 128 </span> iterator <span class="Keyword">||</span><span class="Keyword">=</span> _.identity
|
||||
<span class="line-numbers"> 129 </span> <span class="Keyword">return</span> obj.every(iterator, context) <span class="Keyword">if</span> obj <span class="Keyword">and</span> _.isFunction(obj.every)
|
||||
<span class="line-numbers"> 130 </span> result<span class="Keyword">:</span> <span class="BuiltInConstant">true</span>
|
||||
<span class="line-numbers"> 131 </span> _.each(obj)<span class="FunctionArgument"> value, index, list </span><span class="Storage">=></span>
|
||||
<span class="line-numbers"> 132 </span> _.breakLoop() <span class="Keyword">unless</span> (result<span class="Keyword">:</span> result <span class="Keyword">and</span> iterator.call(context, value, index, list))
|
||||
<span class="line-numbers"> 133 </span> result
|
||||
<span class="line-numbers"> 134 </span>
|
||||
<span class="line-numbers"> 135 </span>
|
||||
<span class="line-numbers"> 136 </span> <span class="Comment"><span class="Comment">#</span> Determine if at least one element in the object matches a truth test. Use</span>
|
||||
<span class="line-numbers"> 137 </span> <span class="Comment"><span class="Comment">#</span> JavaScript 1.6's some(), if it exists.</span>
|
||||
<span class="line-numbers"> 138 </span> <span class="FunctionName">_.any</span><span class="Keyword">:</span> <span class="FunctionArgument">obj, iterator, context</span> <span class="Storage">=></span>
|
||||
<span class="line-numbers"> 139 </span> iterator <span class="Keyword">||</span><span class="Keyword">=</span> _.identity
|
||||
<span class="line-numbers"> 140 </span> <span class="Keyword">return</span> obj.some(iterator, context) <span class="Keyword">if</span> obj <span class="Keyword">and</span> _.isFunction(obj.some)
|
||||
<span class="line-numbers"> 141 </span> result<span class="Keyword">:</span> <span class="BuiltInConstant">false</span>
|
||||
<span class="line-numbers"> 142 </span> _.each(obj)<span class="FunctionArgument"> value, index, list </span><span class="Storage">=></span>
|
||||
<span class="line-numbers"> 143 </span> _.breakLoop() <span class="Keyword">if</span> (result<span class="Keyword">:</span> iterator.call(context, value, index, list))
|
||||
<span class="line-numbers"> 144 </span> result
|
||||
<span class="line-numbers"> 145 </span>
|
||||
<span class="line-numbers"> 146 </span>
|
||||
<span class="line-numbers"> 147 </span> <span class="Comment"><span class="Comment">#</span> Determine if a given value is included in the array or object,</span>
|
||||
<span class="line-numbers"> 148 </span> <span class="Comment"><span class="Comment">#</span> based on '==='.</span>
|
||||
<span class="line-numbers"> 149 </span> <span class="FunctionName">_.include</span><span class="Keyword">:</span> <span class="FunctionArgument">obj, target</span> <span class="Storage">=></span>
|
||||
<span class="line-numbers"> 150 </span> <span class="Keyword">return</span> _.indexOf(obj, target) <span class="Keyword">isnt</span> <span class="Keyword">-</span><span class="Number">1</span> <span class="Keyword">if</span> _.isArray(obj)
|
||||
<span class="line-numbers"> 151 </span> <span class="Keyword">for</span> val <span class="Keyword">in</span> obj
|
||||
<span class="line-numbers"> 152 </span> <span class="Keyword">return</span> <span class="BuiltInConstant">true</span> <span class="Keyword">if</span> val <span class="Keyword">is</span> target
|
||||
<span class="line-numbers"> 153 </span> <span class="BuiltInConstant">false</span>
|
||||
<span class="line-numbers"> 154 </span>
|
||||
<span class="line-numbers"> 155 </span>
|
||||
<span class="line-numbers"> 156 </span> <span class="Comment"><span class="Comment">#</span> Invoke a method with arguments on every item in a collection.</span>
|
||||
<span class="line-numbers"> 157 </span> <span class="FunctionName">_.invoke</span><span class="Keyword">:</span> <span class="FunctionArgument">obj, method</span> <span class="Storage">=></span>
|
||||
<span class="line-numbers"> 158 </span> args<span class="Keyword">:</span> _.rest(arguments, <span class="Number">2</span>)
|
||||
<span class="line-numbers"> 159 </span> (<span class="Keyword">if</span> method <span class="Keyword">then</span> val[method] <span class="Keyword">else</span> val).apply(val, args) <span class="Keyword">for</span> val <span class="Keyword">in</span> obj
|
||||
<span class="line-numbers"> 160 </span>
|
||||
<span class="line-numbers"> 161 </span>
|
||||
<span class="line-numbers"> 162 </span> <span class="Comment"><span class="Comment">#</span> Convenience version of a common use case of map: fetching a property.</span>
|
||||
<span class="line-numbers"> 163 </span> <span class="FunctionName">_.pluck</span><span class="Keyword">:</span> <span class="FunctionArgument">obj, key</span> <span class="Storage">=></span>
|
||||
<span class="line-numbers"> 164 </span> _.map(obj, (<span class="FunctionArgument">val </span><span class="Storage">=></span> val[key]))
|
||||
<span class="line-numbers"> 165 </span>
|
||||
<span class="line-numbers"> 166 </span>
|
||||
<span class="line-numbers"> 167 </span> <span class="Comment"><span class="Comment">#</span> Return the maximum item or (item-based computation).</span>
|
||||
<span class="line-numbers"> 168 </span> <span class="FunctionName">_.max</span><span class="Keyword">:</span> <span class="FunctionArgument">obj, iterator, context</span> <span class="Storage">=></span>
|
||||
<span class="line-numbers"> 169 </span> <span class="Keyword">return</span> Math.max.apply(Math, obj) <span class="Keyword">if</span> <span class="Keyword">not</span> iterator <span class="Keyword">and</span> _.isArray(obj)
|
||||
<span class="line-numbers"> 170 </span> result<span class="Keyword">:</span> {computed<span class="Keyword">:</span> <span class="Keyword">-</span><span class="BuiltInConstant">Infinity</span>}
|
||||
<span class="line-numbers"> 171 </span> _.each(obj)<span class="FunctionArgument"> value, index, list </span><span class="Storage">=></span>
|
||||
<span class="line-numbers"> 172 </span> computed<span class="Keyword">:</span> <span class="Keyword">if</span> iterator <span class="Keyword">then</span> iterator.call(context, value, index, list) <span class="Keyword">else</span> value
|
||||
<span class="line-numbers"> 173 </span> computed <span class="Keyword">>=</span> result.computed <span class="Keyword">and</span> (result<span class="Keyword">:</span> {value<span class="Keyword">:</span> value, computed<span class="Keyword">:</span> computed})
|
||||
<span class="line-numbers"> 174 </span> result.value
|
||||
<span class="line-numbers"> 175 </span>
|
||||
<span class="line-numbers"> 176 </span>
|
||||
<span class="line-numbers"> 177 </span> <span class="Comment"><span class="Comment">#</span> Return the minimum element (or element-based computation).</span>
|
||||
<span class="line-numbers"> 178 </span> <span class="FunctionName">_.min</span><span class="Keyword">:</span> <span class="FunctionArgument">obj, iterator, context</span> <span class="Storage">=></span>
|
||||
<span class="line-numbers"> 179 </span> <span class="Keyword">return</span> Math.min.apply(Math, obj) <span class="Keyword">if</span> <span class="Keyword">not</span> iterator <span class="Keyword">and</span> _.isArray(obj)
|
||||
<span class="line-numbers"> 180 </span> result<span class="Keyword">:</span> {computed<span class="Keyword">:</span> <span class="BuiltInConstant">Infinity</span>}
|
||||
<span class="line-numbers"> 181 </span> _.each(obj)<span class="FunctionArgument"> value, index, list </span><span class="Storage">=></span>
|
||||
<span class="line-numbers"> 182 </span> computed<span class="Keyword">:</span> <span class="Keyword">if</span> iterator <span class="Keyword">then</span> iterator.call(context, value, index, list) <span class="Keyword">else</span> value
|
||||
<span class="line-numbers"> 183 </span> computed <span class="Keyword"><</span> result.computed <span class="Keyword">and</span> (result<span class="Keyword">:</span> {value<span class="Keyword">:</span> value, computed<span class="Keyword">:</span> computed})
|
||||
<span class="line-numbers"> 184 </span> result.value
|
||||
<span class="line-numbers"> 185 </span>
|
||||
<span class="line-numbers"> 186 </span>
|
||||
<span class="line-numbers"> 187 </span> <span class="Comment"><span class="Comment">#</span> Sort the object's values by a criteria produced by an iterator.</span>
|
||||
<span class="line-numbers"> 188 </span> <span class="FunctionName">_.sortBy</span><span class="Keyword">:</span> <span class="FunctionArgument">obj, iterator, context</span> <span class="Storage">=></span>
|
||||
<span class="line-numbers"> 189 </span> _.pluck(((_.map(obj)<span class="FunctionArgument"> value, index, list </span><span class="Storage">=></span>
|
||||
<span class="line-numbers"> 190 </span> {value<span class="Keyword">:</span> value, criteria<span class="Keyword">:</span> iterator.call(context, value, index, list)}
|
||||
<span class="line-numbers"> 191 </span> ).sort()<span class="FunctionArgument"> left, right </span><span class="Storage">=></span>
|
||||
<span class="line-numbers"> 192 </span> a<span class="Keyword">:</span> left.criteria; b<span class="Keyword">:</span> right.criteria
|
||||
<span class="line-numbers"> 193 </span> <span class="Keyword">if</span> a <span class="Keyword"><</span> b <span class="Keyword">then</span> <span class="Keyword">-</span><span class="Number">1</span> <span class="Keyword">else</span> <span class="Keyword">if</span> a <span class="Keyword">></span> b <span class="Keyword">then</span> <span class="Number">1</span> <span class="Keyword">else</span> <span class="Number">0</span>
|
||||
<span class="line-numbers"> 194 </span> ), <span class="String"><span class="String">'</span>value<span class="String">'</span></span>)
|
||||
<span class="line-numbers"> 195 </span>
|
||||
<span class="line-numbers"> 196 </span>
|
||||
<span class="line-numbers"> 197 </span> <span class="Comment"><span class="Comment">#</span> Use a comparator function to figure out at what index an object should</span>
|
||||
<span class="line-numbers"> 198 </span> <span class="Comment"><span class="Comment">#</span> be inserted so as to maintain order. Uses binary search.</span>
|
||||
<span class="line-numbers"> 199 </span> <span class="FunctionName">_.sortedIndex</span><span class="Keyword">:</span> <span class="FunctionArgument">array, obj, iterator</span> <span class="Storage">=></span>
|
||||
<span class="line-numbers"> 200 </span> iterator <span class="Keyword">||</span><span class="Keyword">=</span> _.identity
|
||||
<span class="line-numbers"> 201 </span> low<span class="Keyword">:</span> <span class="Number">0</span>; high<span class="Keyword">:</span> array.length
|
||||
<span class="line-numbers"> 202 </span> <span class="Keyword">while</span> low <span class="Keyword"><</span> high
|
||||
<span class="line-numbers"> 203 </span> mid<span class="Keyword">:</span> (low <span class="Keyword">+</span> high) <span class="Keyword">></span><span class="Keyword">></span> <span class="Number">1</span>
|
||||
<span class="line-numbers"> 204 </span> <span class="Keyword">if</span> iterator(array[mid]) <span class="Keyword"><</span> iterator(obj) <span class="Keyword">then</span> low<span class="Keyword">:</span> mid <span class="Keyword">+</span> <span class="Number">1</span> <span class="Keyword">else</span> high<span class="Keyword">:</span> mid
|
||||
<span class="line-numbers"> 205 </span> low
|
||||
<span class="line-numbers"> 206 </span>
|
||||
<span class="line-numbers"> 207 </span>
|
||||
<span class="line-numbers"> 208 </span> <span class="Comment"><span class="Comment">#</span> Convert anything iterable into a real, live array.</span>
|
||||
<span class="line-numbers"> 209 </span> <span class="FunctionName">_.toArray</span><span class="Keyword">:</span> <span class="FunctionArgument">iterable</span> <span class="Storage">=></span>
|
||||
<span class="line-numbers"> 210 </span> <span class="Keyword">return</span> [] <span class="Keyword">if</span> (<span class="Keyword">!</span>iterable)
|
||||
<span class="line-numbers"> 211 </span> <span class="Keyword">return</span> iterable.toArray() <span class="Keyword">if</span> (iterable.toArray)
|
||||
<span class="line-numbers"> 212 </span> <span class="Keyword">return</span> iterable <span class="Keyword">if</span> (_.isArray(iterable))
|
||||
<span class="line-numbers"> 213 </span> <span class="Keyword">return</span> slice.call(iterable) <span class="Keyword">if</span> (_.isArguments(iterable))
|
||||
<span class="line-numbers"> 214 </span> _.values(iterable)
|
||||
<span class="line-numbers"> 215 </span>
|
||||
<span class="line-numbers"> 216 </span>
|
||||
<span class="line-numbers"> 217 </span> <span class="Comment"><span class="Comment">#</span> Return the number of elements in an object.</span>
|
||||
<span class="line-numbers"> 218 </span> <span class="FunctionName">_.size</span><span class="Keyword">:</span> <span class="FunctionArgument">obj</span> <span class="Storage">=></span> _.toArray(obj).length
|
||||
<span class="line-numbers"> 219 </span>
|
||||
<span class="line-numbers"> 220 </span>
|
||||
<span class="line-numbers"> 221 </span> <span class="Comment"><span class="Comment">#</span> -------------------------- Array Functions: ------------------------------</span>
|
||||
<span class="line-numbers"> 222 </span>
|
||||
<span class="line-numbers"> 223 </span> <span class="Comment"><span class="Comment">#</span> Get the first element of an array. Passing "n" will return the first N</span>
|
||||
<span class="line-numbers"> 224 </span> <span class="Comment"><span class="Comment">#</span> values in the array. Aliased as "head". The "guard" check allows it to work</span>
|
||||
<span class="line-numbers"> 225 </span> <span class="Comment"><span class="Comment">#</span> with _.map.</span>
|
||||
<span class="line-numbers"> 226 </span> <span class="FunctionName">_.first</span><span class="Keyword">:</span> <span class="FunctionArgument">array, n, guard</span> <span class="Storage">=></span>
|
||||
<span class="line-numbers"> 227 </span> <span class="Keyword">if</span> n <span class="Keyword">and</span> <span class="Keyword">not</span> guard <span class="Keyword">then</span> slice.call(array, <span class="Number">0</span>, n) <span class="Keyword">else</span> array[<span class="Number">0</span>]
|
||||
<span class="line-numbers"> 228 </span>
|
||||
<span class="line-numbers"> 229 </span>
|
||||
<span class="line-numbers"> 230 </span> <span class="Comment"><span class="Comment">#</span> Returns everything but the first entry of the array. Aliased as "tail".</span>
|
||||
<span class="line-numbers"> 231 </span> <span class="Comment"><span class="Comment">#</span> Especially useful on the arguments object. Passing an "index" will return</span>
|
||||
<span class="line-numbers"> 232 </span> <span class="Comment"><span class="Comment">#</span> the rest of the values in the array from that index onward. The "guard"</span>
|
||||
<span class="line-numbers"> 233 </span> <span class="Comment"><span class="Comment">#</span> check allows it to work with _.map.</span>
|
||||
<span class="line-numbers"> 234 </span> <span class="FunctionName">_.rest</span><span class="Keyword">:</span> <span class="FunctionArgument">array, index, guard</span> <span class="Storage">=></span>
|
||||
<span class="line-numbers"> 235 </span> slice.call(array, <span class="Keyword">if</span> _.isUndefined(index) <span class="Keyword">or</span> guard <span class="Keyword">then</span> <span class="Number">1</span> <span class="Keyword">else</span> index)
|
||||
<span class="line-numbers"> 236 </span>
|
||||
<span class="line-numbers"> 237 </span>
|
||||
<span class="line-numbers"> 238 </span> <span class="Comment"><span class="Comment">#</span> Get the last element of an array.</span>
|
||||
<span class="line-numbers"> 239 </span> <span class="FunctionName">_.last</span><span class="Keyword">:</span> <span class="FunctionArgument">array</span> <span class="Storage">=></span> array[array.length <span class="Keyword">-</span> <span class="Number">1</span>]
|
||||
<span class="line-numbers"> 240 </span>
|
||||
<span class="line-numbers"> 241 </span>
|
||||
<span class="line-numbers"> 242 </span> <span class="Comment"><span class="Comment">#</span> Trim out all falsy values from an array.</span>
|
||||
<span class="line-numbers"> 243 </span> <span class="FunctionName">_.compact</span><span class="Keyword">:</span> <span class="FunctionArgument">array</span> <span class="Storage">=></span> array[i] <span class="Keyword">for</span> i <span class="Keyword">in</span> [<span class="Number">0</span>...array.length] <span class="Keyword">when</span> array[i]
|
||||
<span class="line-numbers"> 244 </span>
|
||||
<span class="line-numbers"> 245 </span>
|
||||
<span class="line-numbers"> 246 </span> <span class="Comment"><span class="Comment">#</span> Return a completely flattened version of an array.</span>
|
||||
<span class="line-numbers"> 247 </span> <span class="FunctionName">_.flatten</span><span class="Keyword">:</span> <span class="FunctionArgument">array</span> <span class="Storage">=></span>
|
||||
<span class="line-numbers"> 248 </span> _.reduce(array, [])<span class="FunctionArgument"> memo, value </span><span class="Storage">=></span>
|
||||
<span class="line-numbers"> 249 </span> <span class="Keyword">return</span> memo.concat(_.flatten(value)) <span class="Keyword">if</span> _.isArray(value)
|
||||
<span class="line-numbers"> 250 </span> memo.push(value)
|
||||
<span class="line-numbers"> 251 </span> memo
|
||||
<span class="line-numbers"> 252 </span>
|
||||
<span class="line-numbers"> 253 </span>
|
||||
<span class="line-numbers"> 254 </span> <span class="Comment"><span class="Comment">#</span> Return a version of the array that does not contain the specified value(s).</span>
|
||||
<span class="line-numbers"> 255 </span> <span class="FunctionName">_.without</span><span class="Keyword">:</span> <span class="FunctionArgument">array</span> <span class="Storage">=></span>
|
||||
<span class="line-numbers"> 256 </span> values<span class="Keyword">:</span> _.rest(arguments)
|
||||
<span class="line-numbers"> 257 </span> val <span class="Keyword">for</span> val <span class="Keyword">in</span> _.toArray(array) <span class="Keyword">when</span> <span class="Keyword">not</span> _.include(values, val)
|
||||
<span class="line-numbers"> 258 </span>
|
||||
<span class="line-numbers"> 259 </span>
|
||||
<span class="line-numbers"> 260 </span> <span class="Comment"><span class="Comment">#</span> Produce a duplicate-free version of the array. If the array has already</span>
|
||||
<span class="line-numbers"> 261 </span> <span class="Comment"><span class="Comment">#</span> been sorted, you have the option of using a faster algorithm.</span>
|
||||
<span class="line-numbers"> 262 </span> <span class="FunctionName">_.uniq</span><span class="Keyword">:</span> <span class="FunctionArgument">array, isSorted</span> <span class="Storage">=></span>
|
||||
<span class="line-numbers"> 263 </span> memo<span class="Keyword">:</span> []
|
||||
<span class="line-numbers"> 264 </span> <span class="Keyword">for</span> el, i <span class="Keyword">in</span> _.toArray(array)
|
||||
<span class="line-numbers"> 265 </span> memo.push(el) <span class="Keyword">if</span> i <span class="Keyword">is</span> <span class="Number">0</span> <span class="Keyword">||</span> (<span class="Keyword">if</span> isSorted <span class="Keyword">is</span> <span class="BuiltInConstant">true</span> <span class="Keyword">then</span> _.last(memo) <span class="Keyword">isnt</span> el <span class="Keyword">else</span> <span class="Keyword">not</span> _.include(memo, el))
|
||||
<span class="line-numbers"> 266 </span> memo
|
||||
<span class="line-numbers"> 267 </span>
|
||||
<span class="line-numbers"> 268 </span>
|
||||
<span class="line-numbers"> 269 </span> <span class="Comment"><span class="Comment">#</span> Produce an array that contains every item shared between all the</span>
|
||||
<span class="line-numbers"> 270 </span> <span class="Comment"><span class="Comment">#</span> passed-in arrays.</span>
|
||||
<span class="line-numbers"> 271 </span> <span class="FunctionName">_.intersect</span><span class="Keyword">:</span> <span class="FunctionArgument">array</span> <span class="Storage">=></span>
|
||||
<span class="line-numbers"> 272 </span> rest<span class="Keyword">:</span> _.rest(arguments)
|
||||
<span class="line-numbers"> 273 </span> _.select(_.uniq(array))<span class="FunctionArgument"> item </span><span class="Storage">=></span>
|
||||
<span class="line-numbers"> 274 </span> _.all(rest)<span class="FunctionArgument"> other </span><span class="Storage">=></span>
|
||||
<span class="line-numbers"> 275 </span> _.indexOf(other, item) <span class="Keyword">>=</span> <span class="Number">0</span>
|
||||
<span class="line-numbers"> 276 </span>
|
||||
<span class="line-numbers"> 277 </span>
|
||||
<span class="line-numbers"> 278 </span> <span class="Comment"><span class="Comment">#</span> Zip together multiple lists into a single array -- elements that share</span>
|
||||
<span class="line-numbers"> 279 </span> <span class="Comment"><span class="Comment">#</span> an index go together.</span>
|
||||
<span class="line-numbers"> 280 </span> <span class="FunctionName">_.zip</span><span class="Keyword">:</span> <span class="Storage">=></span>
|
||||
<span class="line-numbers"> 281 </span> args<span class="Keyword">:</span> _.toArray(arguments)
|
||||
<span class="line-numbers"> 282 </span> length<span class="Keyword">:</span> _.max(_.pluck(args, <span class="String"><span class="String">'</span>length<span class="String">'</span></span>))
|
||||
<span class="line-numbers"> 283 </span> results<span class="Keyword">:</span> <span class="Keyword">new</span> <span class="TypeName">Array</span>(length)
|
||||
<span class="line-numbers"> 284 </span> <span class="Keyword">for</span> i <span class="Keyword">in</span> [<span class="Number">0</span>...length]
|
||||
<span class="line-numbers"> 285 </span> results[i]<span class="Keyword">:</span> _.pluck(args, String(i))
|
||||
<span class="line-numbers"> 286 </span> results
|
||||
<span class="line-numbers"> 287 </span>
|
||||
<span class="line-numbers"> 288 </span>
|
||||
<span class="line-numbers"> 289 </span> <span class="Comment"><span class="Comment">#</span> If the browser doesn't supply us with indexOf (I'm looking at you, MSIE),</span>
|
||||
<span class="line-numbers"> 290 </span> <span class="Comment"><span class="Comment">#</span> we need this function. Return the position of the first occurence of an</span>
|
||||
<span class="line-numbers"> 291 </span> <span class="Comment"><span class="Comment">#</span> item in an array, or -1 if the item is not included in the array.</span>
|
||||
<span class="line-numbers"> 292 </span> <span class="FunctionName">_.indexOf</span><span class="Keyword">:</span> <span class="FunctionArgument">array, item</span> <span class="Storage">=></span>
|
||||
<span class="line-numbers"> 293 </span> <span class="Keyword">return</span> array.indexOf(item) <span class="Keyword">if</span> array.indexOf
|
||||
<span class="line-numbers"> 294 </span> i<span class="Keyword">:</span> <span class="Number">0</span>; l<span class="Keyword">:</span> array.length
|
||||
<span class="line-numbers"> 295 </span> <span class="Keyword">while</span> l <span class="Keyword">-</span> i
|
||||
<span class="line-numbers"> 296 </span> <span class="Keyword">if</span> array[i] <span class="Keyword">is</span> item <span class="Keyword">then</span> <span class="Keyword">return</span> i <span class="Keyword">else</span> i<span class="Keyword">++</span>
|
||||
<span class="line-numbers"> 297 </span> <span class="Keyword">-</span><span class="Number">1</span>
|
||||
<span class="line-numbers"> 298 </span>
|
||||
<span class="line-numbers"> 299 </span>
|
||||
<span class="line-numbers"> 300 </span> <span class="Comment"><span class="Comment">#</span> Provide JavaScript 1.6's lastIndexOf, delegating to the native function,</span>
|
||||
<span class="line-numbers"> 301 </span> <span class="Comment"><span class="Comment">#</span> if possible.</span>
|
||||
<span class="line-numbers"> 302 </span> <span class="FunctionName">_.lastIndexOf</span><span class="Keyword">:</span> <span class="FunctionArgument">array, item</span> <span class="Storage">=></span>
|
||||
<span class="line-numbers"> 303 </span> <span class="Keyword">return</span> array.lastIndexOf(item) <span class="Keyword">if</span> array.lastIndexOf
|
||||
<span class="line-numbers"> 304 </span> i<span class="Keyword">:</span> array.length
|
||||
<span class="line-numbers"> 305 </span> <span class="Keyword">while</span> i
|
||||
<span class="line-numbers"> 306 </span> <span class="Keyword">if</span> array[i] <span class="Keyword">is</span> item <span class="Keyword">then</span> <span class="Keyword">return</span> i <span class="Keyword">else</span> i<span class="Keyword">--</span>
|
||||
<span class="line-numbers"> 307 </span> <span class="Keyword">-</span><span class="Number">1</span>
|
||||
<span class="line-numbers"> 308 </span>
|
||||
<span class="line-numbers"> 309 </span>
|
||||
<span class="line-numbers"> 310 </span> <span class="Comment"><span class="Comment">#</span> Generate an integer Array containing an arithmetic progression. A port of</span>
|
||||
<span class="line-numbers"> 311 </span> <span class="Comment"><span class="Comment">#</span> the native Python range() function. See:</span>
|
||||
<span class="line-numbers"> 312 </span> <span class="Comment"><span class="Comment">#</span> http://docs.python.org/library/functions.html#range</span>
|
||||
<span class="line-numbers"> 313 </span> <span class="FunctionName">_.range</span><span class="Keyword">:</span> <span class="FunctionArgument">start, stop, step</span> <span class="Storage">=></span>
|
||||
<span class="line-numbers"> 314 </span> a<span class="Keyword">:</span> _.toArray(arguments)
|
||||
<span class="line-numbers"> 315 </span> solo<span class="Keyword">:</span> a.length <span class="Keyword"><=</span> <span class="Number">1</span>
|
||||
<span class="line-numbers"> 316 </span> i<span class="Keyword">:</span> start<span class="Keyword">:</span> <span class="Keyword">if</span> solo <span class="Keyword">then</span> <span class="Number">0</span> <span class="Keyword">else</span> a[<span class="Number">0</span>];
|
||||
<span class="line-numbers"> 317 </span> stop<span class="Keyword">:</span> <span class="Keyword">if</span> solo <span class="Keyword">then</span> a[<span class="Number">0</span>] <span class="Keyword">else</span> a[<span class="Number">1</span>];
|
||||
<span class="line-numbers"> 318 </span> step<span class="Keyword">:</span> a[<span class="Number">2</span>] <span class="Keyword">or</span> <span class="Number">1</span>
|
||||
<span class="line-numbers"> 319 </span> len<span class="Keyword">:</span> Math.ceil((stop <span class="Keyword">-</span> start) <span class="Keyword">/</span> step)
|
||||
<span class="line-numbers"> 320 </span> <span class="Keyword">return</span> [] <span class="Keyword">if</span> len <span class="Keyword"><=</span> <span class="Number">0</span>
|
||||
<span class="line-numbers"> 321 </span> range<span class="Keyword">:</span> <span class="Keyword">new</span> <span class="TypeName">Array</span>(len)
|
||||
<span class="line-numbers"> 322 </span> idx<span class="Keyword">:</span> <span class="Number">0</span>
|
||||
<span class="line-numbers"> 323 </span> <span class="Keyword">while</span> <span class="BuiltInConstant">true</span>
|
||||
<span class="line-numbers"> 324 </span> <span class="Keyword">return</span> range <span class="Keyword">if</span> (<span class="Keyword">if</span> step <span class="Keyword">></span> <span class="Number">0</span> <span class="Keyword">then</span> i <span class="Keyword">-</span> stop <span class="Keyword">else</span> stop <span class="Keyword">-</span> i) <span class="Keyword">>=</span> <span class="Number">0</span>
|
||||
<span class="line-numbers"> 325 </span> range[idx]<span class="Keyword">:</span> i
|
||||
<span class="line-numbers"> 326 </span> idx<span class="Keyword">++</span>
|
||||
<span class="line-numbers"> 327 </span> i<span class="Keyword">+</span><span class="Keyword">=</span> step
|
||||
<span class="line-numbers"> 328 </span>
|
||||
<span class="line-numbers"> 329 </span>
|
||||
<span class="line-numbers"> 330 </span> <span class="Comment"><span class="Comment">#</span> ----------------------- Function Functions: -----------------------------</span>
|
||||
<span class="line-numbers"> 331 </span>
|
||||
<span class="line-numbers"> 332 </span> <span class="Comment"><span class="Comment">#</span> Create a function bound to a given object (assigning 'this', and arguments,</span>
|
||||
<span class="line-numbers"> 333 </span> <span class="Comment"><span class="Comment">#</span> optionally). Binding with arguments is also known as 'curry'.</span>
|
||||
<span class="line-numbers"> 334 </span> <span class="FunctionName">_.bind</span><span class="Keyword">:</span> <span class="FunctionArgument">func, obj</span> <span class="Storage">=></span>
|
||||
<span class="line-numbers"> 335 </span> args<span class="Keyword">:</span> _.rest(arguments, <span class="Number">2</span>)
|
||||
<span class="line-numbers"> 336 </span> <span class="FunctionArgument"> </span><span class="Storage">=></span> func.apply(obj <span class="Keyword">or</span> root, args.concat(_.toArray(arguments)))
|
||||
<span class="line-numbers"> 337 </span>
|
||||
<span class="line-numbers"> 338 </span>
|
||||
<span class="line-numbers"> 339 </span> <span class="Comment"><span class="Comment">#</span> Bind all of an object's methods to that object. Useful for ensuring that</span>
|
||||
<span class="line-numbers"> 340 </span> <span class="Comment"><span class="Comment">#</span> all callbacks defined on an object belong to it.</span>
|
||||
<span class="line-numbers"> 341 </span> <span class="FunctionName">_.bindAll</span><span class="Keyword">:</span> <span class="FunctionArgument">obj</span> <span class="Storage">=></span>
|
||||
<span class="line-numbers"> 342 </span> funcs<span class="Keyword">:</span> <span class="Keyword">if</span> arguments.length <span class="Keyword">></span> <span class="Number">1</span> <span class="Keyword">then</span> _.rest(arguments) <span class="Keyword">else</span> _.functions(obj)
|
||||
<span class="line-numbers"> 343 </span> _.each(funcs, (<span class="FunctionArgument">f </span><span class="Storage">=></span> obj[f]<span class="Keyword">:</span> _.bind(obj[f], obj)))
|
||||
<span class="line-numbers"> 344 </span> obj
|
||||
<span class="line-numbers"> 345 </span>
|
||||
<span class="line-numbers"> 346 </span>
|
||||
<span class="line-numbers"> 347 </span> <span class="Comment"><span class="Comment">#</span> Delays a function for the given number of milliseconds, and then calls</span>
|
||||
<span class="line-numbers"> 348 </span> <span class="Comment"><span class="Comment">#</span> it with the arguments supplied.</span>
|
||||
<span class="line-numbers"> 349 </span> <span class="FunctionName">_.delay</span><span class="Keyword">:</span> <span class="FunctionArgument">func, wait</span> <span class="Storage">=></span>
|
||||
<span class="line-numbers"> 350 </span> args<span class="Keyword">:</span> _.rest(arguments, <span class="Number">2</span>)
|
||||
<span class="line-numbers"> 351 </span> setTimeout((<span class="Storage">=></span> func.apply(func, args)), wait)
|
||||
<span class="line-numbers"> 352 </span>
|
||||
<span class="line-numbers"> 353 </span>
|
||||
<span class="line-numbers"> 354 </span> <span class="Comment"><span class="Comment">#</span> Defers a function, scheduling it to run after the current call stack has</span>
|
||||
<span class="line-numbers"> 355 </span> <span class="Comment"><span class="Comment">#</span> cleared.</span>
|
||||
<span class="line-numbers"> 356 </span> <span class="FunctionName">_.defer</span><span class="Keyword">:</span> <span class="FunctionArgument">func</span> <span class="Storage">=></span>
|
||||
<span class="line-numbers"> 357 </span> _.delay.apply(_, [func, <span class="Number">1</span>].concat(_.rest(arguments)))
|
||||
<span class="line-numbers"> 358 </span>
|
||||
<span class="line-numbers"> 359 </span>
|
||||
<span class="line-numbers"> 360 </span> <span class="Comment"><span class="Comment">#</span> Returns the first function passed as an argument to the second,</span>
|
||||
<span class="line-numbers"> 361 </span> <span class="Comment"><span class="Comment">#</span> allowing you to adjust arguments, run code before and after, and</span>
|
||||
<span class="line-numbers"> 362 </span> <span class="Comment"><span class="Comment">#</span> conditionally execute the original function.</span>
|
||||
<span class="line-numbers"> 363 </span> <span class="FunctionName">_.wrap</span><span class="Keyword">:</span> <span class="FunctionArgument">func, wrapper</span> <span class="Storage">=></span>
|
||||
<span class="line-numbers"> 364 </span> <span class="FunctionArgument"> </span><span class="Storage">=></span> wrapper.apply(wrapper, [func].concat(_.toArray(arguments)))
|
||||
<span class="line-numbers"> 365 </span>
|
||||
<span class="line-numbers"> 366 </span>
|
||||
<span class="line-numbers"> 367 </span> <span class="Comment"><span class="Comment">#</span> Returns a function that is the composition of a list of functions, each</span>
|
||||
<span class="line-numbers"> 368 </span> <span class="Comment"><span class="Comment">#</span> consuming the return value of the function that follows.</span>
|
||||
<span class="line-numbers"> 369 </span> <span class="FunctionName">_.compose</span><span class="Keyword">:</span> <span class="Storage">=></span>
|
||||
<span class="line-numbers"> 370 </span> funcs<span class="Keyword">:</span> _.toArray(arguments)
|
||||
<span class="line-numbers"> 371 </span> <span class="FunctionArgument"> </span><span class="Storage">=></span>
|
||||
<span class="line-numbers"> 372 </span> args<span class="Keyword">:</span> _.toArray(arguments)
|
||||
<span class="line-numbers"> 373 </span> <span class="Keyword">for</span> i <span class="Keyword">in</span> [(funcs.length <span class="Keyword">-</span> <span class="Number">1</span>)..<span class="Number">0</span>]
|
||||
<span class="line-numbers"> 374 </span> args<span class="Keyword">:</span> [funcs[i].apply(<span class="Variable">this</span>, args)]
|
||||
<span class="line-numbers"> 375 </span> args[<span class="Number">0</span>]
|
||||
<span class="line-numbers"> 376 </span>
|
||||
<span class="line-numbers"> 377 </span>
|
||||
<span class="line-numbers"> 378 </span> <span class="Comment"><span class="Comment">#</span> ------------------------- Object Functions: ----------------------------</span>
|
||||
<span class="line-numbers"> 379 </span>
|
||||
<span class="line-numbers"> 380 </span> <span class="Comment"><span class="Comment">#</span> Retrieve the names of an object's properties.</span>
|
||||
<span class="line-numbers"> 381 </span> <span class="FunctionName">_.keys</span><span class="Keyword">:</span> <span class="FunctionArgument">obj</span> <span class="Storage">=></span>
|
||||
<span class="line-numbers"> 382 </span> <span class="Keyword">return</span> _.range(<span class="Number">0</span>, obj.length) <span class="Keyword">if</span> _.isArray(obj)
|
||||
<span class="line-numbers"> 383 </span> key <span class="Keyword">for</span> val, key <span class="Keyword">in</span> obj
|
||||
<span class="line-numbers"> 384 </span>
|
||||
<span class="line-numbers"> 385 </span>
|
||||
<span class="line-numbers"> 386 </span> <span class="Comment"><span class="Comment">#</span> Retrieve the values of an object's properties.</span>
|
||||
<span class="line-numbers"> 387 </span> <span class="FunctionName">_.values</span><span class="Keyword">:</span> <span class="FunctionArgument">obj</span> <span class="Storage">=></span>
|
||||
<span class="line-numbers"> 388 </span> _.map(obj, _.identity)
|
||||
<span class="line-numbers"> 389 </span>
|
||||
<span class="line-numbers"> 390 </span>
|
||||
<span class="line-numbers"> 391 </span> <span class="Comment"><span class="Comment">#</span> Return a sorted list of the function names available in Underscore.</span>
|
||||
<span class="line-numbers"> 392 </span> <span class="FunctionName">_.functions</span><span class="Keyword">:</span> <span class="FunctionArgument">obj</span> <span class="Storage">=></span>
|
||||
<span class="line-numbers"> 393 </span> _.select(_.keys(obj)<span class="FunctionArgument">, key </span><span class="Storage">=></span> _.isFunction(obj[key])).sort()
|
||||
<span class="line-numbers"> 394 </span>
|
||||
<span class="line-numbers"> 395 </span>
|
||||
<span class="line-numbers"> 396 </span> <span class="Comment"><span class="Comment">#</span> Extend a given object with all of the properties in a source object.</span>
|
||||
<span class="line-numbers"> 397 </span> <span class="FunctionName">_.extend</span><span class="Keyword">:</span> <span class="FunctionArgument">destination, source</span> <span class="Storage">=></span>
|
||||
<span class="line-numbers"> 398 </span> <span class="Keyword">for</span> val, key <span class="Keyword">in</span> source
|
||||
<span class="line-numbers"> 399 </span> destination[key]<span class="Keyword">:</span> val
|
||||
<span class="line-numbers"> 400 </span> destination
|
||||
<span class="line-numbers"> 401 </span>
|
||||
<span class="line-numbers"> 402 </span>
|
||||
<span class="line-numbers"> 403 </span> <span class="Comment"><span class="Comment">#</span> Create a (shallow-cloned) duplicate of an object.</span>
|
||||
<span class="line-numbers"> 404 </span> <span class="FunctionName">_.clone</span><span class="Keyword">:</span> <span class="FunctionArgument">obj</span> <span class="Storage">=></span>
|
||||
<span class="line-numbers"> 405 </span> <span class="Keyword">return</span> obj.slice(<span class="Number">0</span>) <span class="Keyword">if</span> _.isArray(obj)
|
||||
<span class="line-numbers"> 406 </span> _.extend({}, obj)
|
||||
<span class="line-numbers"> 407 </span>
|
||||
<span class="line-numbers"> 408 </span>
|
||||
<span class="line-numbers"> 409 </span> <span class="Comment"><span class="Comment">#</span> Invokes interceptor with the obj, and then returns obj.</span>
|
||||
<span class="line-numbers"> 410 </span> <span class="Comment"><span class="Comment">#</span> The primary purpose of this method is to "tap into" a method chain, in order to perform operations on intermediate results within the chain.</span>
|
||||
<span class="line-numbers"> 411 </span> <span class="FunctionName">_.tap</span><span class="Keyword">:</span> <span class="FunctionArgument">obj, interceptor</span> <span class="Storage">=></span>
|
||||
<span class="line-numbers"> 412 </span> interceptor(obj)
|
||||
<span class="line-numbers"> 413 </span> obj
|
||||
<span class="line-numbers"> 414 </span>
|
||||
<span class="line-numbers"> 415 </span>
|
||||
<span class="line-numbers"> 416 </span> <span class="Comment"><span class="Comment">#</span> Perform a deep comparison to check if two objects are equal.</span>
|
||||
<span class="line-numbers"> 417 </span> <span class="FunctionName">_.isEqual</span><span class="Keyword">:</span> <span class="FunctionArgument">a, b</span> <span class="Storage">=></span>
|
||||
<span class="line-numbers"> 418 </span> <span class="Comment"><span class="Comment">#</span> Check object identity.</span>
|
||||
<span class="line-numbers"> 419 </span> <span class="Keyword">return</span> <span class="BuiltInConstant">true</span> <span class="Keyword">if</span> a <span class="Keyword">is</span> b
|
||||
<span class="line-numbers"> 420 </span> <span class="Comment"><span class="Comment">#</span> Different types?</span>
|
||||
<span class="line-numbers"> 421 </span> atype<span class="Keyword">:</span> <span class="Keyword">typeof</span>(a); btype<span class="Keyword">:</span> <span class="Keyword">typeof</span>(b)
|
||||
<span class="line-numbers"> 422 </span> <span class="Keyword">return</span> <span class="BuiltInConstant">false</span> <span class="Keyword">if</span> atype <span class="Keyword">isnt</span> btype
|
||||
<span class="line-numbers"> 423 </span> <span class="Comment"><span class="Comment">#</span> Basic equality test (watch out for coercions).</span>
|
||||
<span class="line-numbers"> 424 </span> <span class="Keyword">return</span> <span class="BuiltInConstant">true</span> <span class="Keyword">if</span> <span class="String"><span class="String">`</span>a == b<span class="String">`</span></span>
|
||||
<span class="line-numbers"> 425 </span> <span class="Comment"><span class="Comment">#</span> One is falsy and the other truthy.</span>
|
||||
<span class="line-numbers"> 426 </span> <span class="Keyword">return</span> <span class="BuiltInConstant">false</span> <span class="Keyword">if</span> (<span class="Keyword">!</span>a <span class="Keyword">and</span> b) <span class="Keyword">or</span> (a <span class="Keyword">and</span> <span class="Keyword">!</span>b)
|
||||
<span class="line-numbers"> 427 </span> <span class="Comment"><span class="Comment">#</span> One of them implements an isEqual()?</span>
|
||||
<span class="line-numbers"> 428 </span> <span class="Keyword">return</span> a.isEqual(b) <span class="Keyword">if</span> a.isEqual
|
||||
<span class="line-numbers"> 429 </span> <span class="Comment"><span class="Comment">#</span> Check dates' integer values.</span>
|
||||
<span class="line-numbers"> 430 </span> <span class="Keyword">return</span> a.getTime() <span class="Keyword">is</span> b.getTime() <span class="Keyword">if</span> _.isDate(a) <span class="Keyword">and</span> _.isDate(b)
|
||||
<span class="line-numbers"> 431 </span> <span class="Comment"><span class="Comment">#</span> Both are NaN?</span>
|
||||
<span class="line-numbers"> 432 </span> <span class="Keyword">return</span> <span class="BuiltInConstant">true</span> <span class="Keyword">if</span> _.isNaN(a) <span class="Keyword">and</span> _.isNaN(b)
|
||||
<span class="line-numbers"> 433 </span> <span class="Comment"><span class="Comment">#</span> Compare regular expressions.</span>
|
||||
<span class="line-numbers"> 434 </span> <span class="Keyword">if</span> _.isRegExp(a) <span class="Keyword">and</span> _.isRegExp(b)
|
||||
<span class="line-numbers"> 435 </span> <span class="Keyword">return</span> a.source <span class="Keyword">is</span> b.source <span class="Keyword">and</span>
|
||||
<span class="line-numbers"> 436 </span> a.global <span class="Keyword">is</span> b.global <span class="Keyword">and</span>
|
||||
<span class="line-numbers"> 437 </span> a.ignoreCase <span class="Keyword">is</span> b.ignoreCase <span class="Keyword">and</span>
|
||||
<span class="line-numbers"> 438 </span> a.multiline <span class="Keyword">is</span> b.multiline
|
||||
<span class="line-numbers"> 439 </span> <span class="Comment"><span class="Comment">#</span> If a is not an object by this point, we can't handle it.</span>
|
||||
<span class="line-numbers"> 440 </span> <span class="Keyword">return</span> <span class="BuiltInConstant">false</span> <span class="Keyword">if</span> atype <span class="Keyword">isnt</span> <span class="String"><span class="String">'</span>object<span class="String">'</span></span>
|
||||
<span class="line-numbers"> 441 </span> <span class="Comment"><span class="Comment">#</span> Check for different array lengths before comparing contents.</span>
|
||||
<span class="line-numbers"> 442 </span> <span class="Keyword">return</span> <span class="BuiltInConstant">false</span> <span class="Keyword">if</span> a.length <span class="Keyword">and</span> (a.length <span class="Keyword">isnt</span> b.length)
|
||||
<span class="line-numbers"> 443 </span> <span class="Comment"><span class="Comment">#</span> Nothing else worked, deep compare the contents.</span>
|
||||
<span class="line-numbers"> 444 </span> aKeys<span class="Keyword">:</span> _.keys(a); bKeys<span class="Keyword">:</span> _.keys(b)
|
||||
<span class="line-numbers"> 445 </span> <span class="Comment"><span class="Comment">#</span> Different object sizes?</span>
|
||||
<span class="line-numbers"> 446 </span> <span class="Keyword">return</span> <span class="BuiltInConstant">false</span> <span class="Keyword">if</span> aKeys.length <span class="Keyword">isnt</span> bKeys.length
|
||||
<span class="line-numbers"> 447 </span> <span class="Comment"><span class="Comment">#</span> Recursive comparison of contents.</span>
|
||||
<span class="line-numbers"> 448 </span> <span class="Comment"><span class="Comment">#</span> for (var key in a) if (!_.isEqual(a[key], b[key])) return false;</span>
|
||||
<span class="line-numbers"> 449 </span> <span class="Keyword">return</span> <span class="BuiltInConstant">true</span>
|
||||
<span class="line-numbers"> 450 </span>
|
||||
<span class="line-numbers"> 451 </span>
|
||||
<span class="line-numbers"> 452 </span> <span class="Comment"><span class="Comment">#</span> Is a given array or object empty?</span>
|
||||
<span class="line-numbers"> 453 </span> <span class="FunctionName">_.isEmpty</span><span class="Keyword">:</span> <span class="FunctionArgument">obj</span> <span class="Storage">=></span> _.keys(obj).length <span class="Keyword">is</span> <span class="Number">0</span>
|
||||
<span class="line-numbers"> 454 </span>
|
||||
<span class="line-numbers"> 455 </span>
|
||||
<span class="line-numbers"> 456 </span> <span class="Comment"><span class="Comment">#</span> Is a given value a DOM element?</span>
|
||||
<span class="line-numbers"> 457 </span> <span class="FunctionName">_.isElement</span><span class="Keyword">:</span> <span class="FunctionArgument">obj</span> <span class="Storage">=></span> obj <span class="Keyword">and</span> obj.nodeType <span class="Keyword">is</span> <span class="Number">1</span>
|
||||
<span class="line-numbers"> 458 </span>
|
||||
<span class="line-numbers"> 459 </span>
|
||||
<span class="line-numbers"> 460 </span> <span class="Comment"><span class="Comment">#</span> Is a given value an array?</span>
|
||||
<span class="line-numbers"> 461 </span> <span class="FunctionName">_.isArray</span><span class="Keyword">:</span> <span class="FunctionArgument">obj</span> <span class="Storage">=></span> <span class="Keyword">!</span><span class="Keyword">!</span>(obj <span class="Keyword">and</span> obj.concat <span class="Keyword">and</span> obj.unshift)
|
||||
<span class="line-numbers"> 462 </span>
|
||||
<span class="line-numbers"> 463 </span>
|
||||
<span class="line-numbers"> 464 </span> <span class="Comment"><span class="Comment">#</span> Is a given variable an arguments object?</span>
|
||||
<span class="line-numbers"> 465 </span> <span class="FunctionName">_.isArguments</span><span class="Keyword">:</span> <span class="FunctionArgument">obj</span> <span class="Storage">=></span> obj <span class="Keyword">and</span> _.isNumber(obj.length) <span class="Keyword">and</span> <span class="Keyword">!</span>_.isArray(obj) <span class="Keyword">and</span> <span class="Keyword">!</span>propertyIsEnumerable.call(obj, <span class="String"><span class="String">'</span>length<span class="String">'</span></span>)
|
||||
<span class="line-numbers"> 466 </span>
|
||||
<span class="line-numbers"> 467 </span>
|
||||
<span class="line-numbers"> 468 </span> <span class="Comment"><span class="Comment">#</span> Is the given value a function?</span>
|
||||
<span class="line-numbers"> 469 </span> <span class="FunctionName">_.isFunction</span><span class="Keyword">:</span> <span class="FunctionArgument">obj</span> <span class="Storage">=></span> <span class="Keyword">!</span><span class="Keyword">!</span>(obj <span class="Keyword">and</span> obj.constructor <span class="Keyword">and</span> obj.call <span class="Keyword">and</span> obj.apply)
|
||||
<span class="line-numbers"> 470 </span>
|
||||
<span class="line-numbers"> 471 </span>
|
||||
<span class="line-numbers"> 472 </span> <span class="Comment"><span class="Comment">#</span> Is the given value a string?</span>
|
||||
<span class="line-numbers"> 473 </span> <span class="FunctionName">_.isString</span><span class="Keyword">:</span> <span class="FunctionArgument">obj</span> <span class="Storage">=></span> <span class="Keyword">!</span><span class="Keyword">!</span>(obj <span class="Keyword">is</span> <span class="String"><span class="String">'</span><span class="String">'</span></span> <span class="Keyword">or</span> (obj <span class="Keyword">and</span> obj.charCodeAt <span class="Keyword">and</span> obj.substr))
|
||||
<span class="line-numbers"> 474 </span>
|
||||
<span class="line-numbers"> 475 </span>
|
||||
<span class="line-numbers"> 476 </span> <span class="Comment"><span class="Comment">#</span> Is a given value a number?</span>
|
||||
<span class="line-numbers"> 477 </span> <span class="FunctionName">_.isNumber</span><span class="Keyword">:</span> <span class="FunctionArgument">obj</span> <span class="Storage">=></span> toString.call(obj) <span class="Keyword">is</span> <span class="String"><span class="String">'</span>[object Number]<span class="String">'</span></span>
|
||||
<span class="line-numbers"> 478 </span>
|
||||
<span class="line-numbers"> 479 </span>
|
||||
<span class="line-numbers"> 480 </span> <span class="Comment"><span class="Comment">#</span> Is a given value a Date?</span>
|
||||
<span class="line-numbers"> 481 </span> <span class="FunctionName">_.isDate</span><span class="Keyword">:</span> <span class="FunctionArgument">obj</span> <span class="Storage">=></span> <span class="Keyword">!</span><span class="Keyword">!</span>(obj <span class="Keyword">and</span> obj.getTimezoneOffset <span class="Keyword">and</span> obj.setUTCFullYear)
|
||||
<span class="line-numbers"> 482 </span>
|
||||
<span class="line-numbers"> 483 </span>
|
||||
<span class="line-numbers"> 484 </span> <span class="Comment"><span class="Comment">#</span> Is the given value a regular expression?</span>
|
||||
<span class="line-numbers"> 485 </span> <span class="FunctionName">_.isRegExp</span><span class="Keyword">:</span> <span class="FunctionArgument">obj</span> <span class="Storage">=></span> <span class="Keyword">!</span><span class="Keyword">!</span>(obj <span class="Keyword">and</span> obj.exec <span class="Keyword">and</span> (obj.ignoreCase <span class="Keyword">or</span> obj.ignoreCase <span class="Keyword">is</span> <span class="BuiltInConstant">false</span>))
|
||||
<span class="line-numbers"> 486 </span>
|
||||
<span class="line-numbers"> 487 </span>
|
||||
<span class="line-numbers"> 488 </span> <span class="Comment"><span class="Comment">#</span> Is the given value NaN -- this one is interesting. NaN != NaN, and</span>
|
||||
<span class="line-numbers"> 489 </span> <span class="Comment"><span class="Comment">#</span> isNaN(undefined) == true, so we make sure it's a number first.</span>
|
||||
<span class="line-numbers"> 490 </span> <span class="FunctionName">_.isNaN</span><span class="Keyword">:</span> <span class="FunctionArgument">obj</span> <span class="Storage">=></span> _.isNumber(obj) <span class="Keyword">and</span> window.isNaN(obj)
|
||||
<span class="line-numbers"> 491 </span>
|
||||
<span class="line-numbers"> 492 </span>
|
||||
<span class="line-numbers"> 493 </span> <span class="Comment"><span class="Comment">#</span> Is a given value equal to null?</span>
|
||||
<span class="line-numbers"> 494 </span> <span class="FunctionName">_.isNull</span><span class="Keyword">:</span> <span class="FunctionArgument">obj</span> <span class="Storage">=></span> obj <span class="Keyword">is</span> <span class="BuiltInConstant">null</span>
|
||||
<span class="line-numbers"> 495 </span>
|
||||
<span class="line-numbers"> 496 </span>
|
||||
<span class="line-numbers"> 497 </span> <span class="Comment"><span class="Comment">#</span> Is a given variable undefined?</span>
|
||||
<span class="line-numbers"> 498 </span> <span class="FunctionName">_.isUndefined</span><span class="Keyword">:</span> <span class="FunctionArgument">obj</span> <span class="Storage">=></span> <span class="Keyword">typeof</span> obj <span class="Keyword">is</span> <span class="String"><span class="String">'</span>undefined<span class="String">'</span></span>
|
||||
<span class="line-numbers"> 499 </span>
|
||||
<span class="line-numbers"> 500 </span>
|
||||
<span class="line-numbers"> 501 </span> <span class="Comment"><span class="Comment">#</span> -------------------------- Utility Functions: --------------------------</span>
|
||||
<span class="line-numbers"> 502 </span>
|
||||
<span class="line-numbers"> 503 </span> <span class="Comment"><span class="Comment">#</span> Run Underscore.js in noConflict mode, returning the '_' variable to its</span>
|
||||
<span class="line-numbers"> 504 </span> <span class="Comment"><span class="Comment">#</span> previous owner. Returns a reference to the Underscore object.</span>
|
||||
<span class="line-numbers"> 505 </span> <span class="FunctionName">_.noConflict</span><span class="Keyword">:</span> <span class="Storage">=></span>
|
||||
<span class="line-numbers"> 506 </span> root._<span class="Keyword">:</span> previousUnderscore
|
||||
<span class="line-numbers"> 507 </span> <span class="Variable">this</span>
|
||||
<span class="line-numbers"> 508 </span>
|
||||
<span class="line-numbers"> 509 </span>
|
||||
<span class="line-numbers"> 510 </span> <span class="Comment"><span class="Comment">#</span> Keep the identity function around for default iterators.</span>
|
||||
<span class="line-numbers"> 511 </span> <span class="FunctionName">_.identity</span><span class="Keyword">:</span> <span class="FunctionArgument">value</span> <span class="Storage">=></span> value
|
||||
<span class="line-numbers"> 512 </span>
|
||||
<span class="line-numbers"> 513 </span>
|
||||
<span class="line-numbers"> 514 </span> <span class="Comment"><span class="Comment">#</span> Break out of the middle of an iteration.</span>
|
||||
<span class="line-numbers"> 515 </span> <span class="FunctionName">_.breakLoop</span><span class="Keyword">:</span> <span class="Storage">=></span> <span class="Keyword">throw</span> breaker
|
||||
<span class="line-numbers"> 516 </span>
|
||||
<span class="line-numbers"> 517 </span>
|
||||
<span class="line-numbers"> 518 </span> <span class="Comment"><span class="Comment">#</span> Generate a unique integer id (unique within the entire client session).</span>
|
||||
<span class="line-numbers"> 519 </span> <span class="Comment"><span class="Comment">#</span> Useful for temporary DOM ids.</span>
|
||||
<span class="line-numbers"> 520 </span> idCounter<span class="Keyword">:</span> <span class="Number">0</span>
|
||||
<span class="line-numbers"> 521 </span> <span class="FunctionName">_.uniqueId</span><span class="Keyword">:</span> <span class="FunctionArgument">prefix</span> <span class="Storage">=></span>
|
||||
<span class="line-numbers"> 522 </span> (prefix <span class="Keyword">or</span> <span class="String"><span class="String">'</span><span class="String">'</span></span>) <span class="Keyword">+</span> idCounter<span class="Keyword">++</span>
|
||||
<span class="line-numbers"> 523 </span>
|
||||
<span class="line-numbers"> 524 </span>
|
||||
<span class="line-numbers"> 525 </span> <span class="Comment"><span class="Comment">#</span> JavaScript templating a-la ERB, pilfered from John Resig's</span>
|
||||
<span class="line-numbers"> 526 </span> <span class="Comment"><span class="Comment">#</span> "Secrets of the JavaScript Ninja", page 83.</span>
|
||||
<span class="line-numbers"> 527 </span> <span class="FunctionName">_.template</span><span class="Keyword">:</span> <span class="FunctionArgument">str, data</span> <span class="Storage">=></span>
|
||||
<span class="line-numbers"> 528 </span> <span class="String"><span class="String">`</span>var fn = new Function('obj',</span>
|
||||
<span class="line-numbers"> 529 </span> <span class="String"> 'var p=[],print=function(){p.push.apply(p,arguments);};' +</span>
|
||||
<span class="line-numbers"> 530 </span> <span class="String"> 'with(obj){p.push(<span class="UserDefinedConstant">\'</span>' +</span>
|
||||
<span class="line-numbers"> 531 </span> <span class="String"> str.</span>
|
||||
<span class="line-numbers"> 532 </span> <span class="String"> replace(/[<span class="UserDefinedConstant">\r</span><span class="UserDefinedConstant">\t</span><span class="UserDefinedConstant">\n</span>]/g, " ").</span>
|
||||
<span class="line-numbers"> 533 </span> <span class="String"> split("<%").join("<span class="UserDefinedConstant">\t</span>").</span>
|
||||
<span class="line-numbers"> 534 </span> <span class="String"> replace(/((^|%>)[^<span class="UserDefinedConstant">\t</span>]*)'/g, "$1<span class="UserDefinedConstant">\r</span>").</span>
|
||||
<span class="line-numbers"> 535 </span> <span class="String"> replace(/<span class="UserDefinedConstant">\t</span>=(.*?)%>/g, "',$1,'").</span>
|
||||
<span class="line-numbers"> 536 </span> <span class="String"> split("<span class="UserDefinedConstant">\t</span>").join("');").</span>
|
||||
<span class="line-numbers"> 537 </span> <span class="String"> split("%>").join("p.push('").</span>
|
||||
<span class="line-numbers"> 538 </span> <span class="String"> split("<span class="UserDefinedConstant">\r</span>").join("<span class="UserDefinedConstant">\\</span>'") +</span>
|
||||
<span class="line-numbers"> 539 </span> <span class="String"> "');}return p.join('');")<span class="String">`</span></span>
|
||||
<span class="line-numbers"> 540 </span> <span class="Keyword">if</span> data <span class="Keyword">then</span> fn(data) <span class="Keyword">else</span> fn
|
||||
<span class="line-numbers"> 541 </span>
|
||||
<span class="line-numbers"> 542 </span>
|
||||
<span class="line-numbers"> 543 </span> <span class="Comment"><span class="Comment">#</span> ------------------------------- Aliases ----------------------------------</span>
|
||||
<span class="line-numbers"> 544 </span>
|
||||
<span class="line-numbers"> 545 </span> _.forEach<span class="Keyword">:</span> _.each
|
||||
<span class="line-numbers"> 546 </span> _.foldl<span class="Keyword">:</span> _.inject<span class="Keyword">:</span> _.reduce
|
||||
<span class="line-numbers"> 547 </span> _.foldr<span class="Keyword">:</span> _.reduceRight
|
||||
<span class="line-numbers"> 548 </span> _.filter<span class="Keyword">:</span> _.select
|
||||
<span class="line-numbers"> 549 </span> _.every<span class="Keyword">:</span> _.all
|
||||
<span class="line-numbers"> 550 </span> _.some<span class="Keyword">:</span> _.any
|
||||
<span class="line-numbers"> 551 </span> _.head<span class="Keyword">:</span> _.first
|
||||
<span class="line-numbers"> 552 </span> _.tail<span class="Keyword">:</span> _.rest
|
||||
<span class="line-numbers"> 553 </span> _.methods<span class="Keyword">:</span> _.functions
|
||||
<span class="line-numbers"> 554 </span>
|
||||
<span class="line-numbers"> 555 </span>
|
||||
<span class="line-numbers"> 556 </span> <span class="Comment"><span class="Comment">#</span> /*------------------------ Setup the OOP Wrapper: --------------------------*/</span>
|
||||
<span class="line-numbers"> 557 </span>
|
||||
<span class="line-numbers"> 558 </span> <span class="Comment"><span class="Comment">#</span> Helper function to continue chaining intermediate results.</span>
|
||||
<span class="line-numbers"> 559 </span> <span class="FunctionName">result</span><span class="Keyword">:</span> <span class="FunctionArgument">obj, chain</span> <span class="Storage">=></span>
|
||||
<span class="line-numbers"> 560 </span> <span class="Keyword">if</span> chain <span class="Keyword">then</span> _(obj).chain() <span class="Keyword">else</span> obj
|
||||
<span class="line-numbers"> 561 </span>
|
||||
<span class="line-numbers"> 562 </span>
|
||||
<span class="line-numbers"> 563 </span> <span class="Comment"><span class="Comment">#</span> Add all of the Underscore functions to the wrapper object.</span>
|
||||
<span class="line-numbers"> 564 </span> _.each(_.functions(_))<span class="FunctionArgument"> name </span><span class="Storage">=></span>
|
||||
<span class="line-numbers"> 565 </span> method<span class="Keyword">:</span> _[name]
|
||||
<span class="line-numbers"> 566 </span> wrapper.prototype[name]<span class="Keyword">:</span> <span class="Storage">=></span>
|
||||
<span class="line-numbers"> 567 </span> unshift.call(arguments, <span class="Variable">this</span>._wrapped)
|
||||
<span class="line-numbers"> 568 </span> result(method.apply(_, arguments), <span class="Variable">this</span>._chain)
|
||||
<span class="line-numbers"> 569 </span>
|
||||
<span class="line-numbers"> 570 </span>
|
||||
<span class="line-numbers"> 571 </span> <span class="Comment"><span class="Comment">#</span> Add all mutator Array functions to the wrapper.</span>
|
||||
<span class="line-numbers"> 572 </span> _.each([<span class="String"><span class="String">'</span>pop<span class="String">'</span></span>, <span class="String"><span class="String">'</span>push<span class="String">'</span></span>, <span class="String"><span class="String">'</span>reverse<span class="String">'</span></span>, <span class="String"><span class="String">'</span>shift<span class="String">'</span></span>, <span class="String"><span class="String">'</span>sort<span class="String">'</span></span>, <span class="String"><span class="String">'</span>splice<span class="String">'</span></span>, <span class="String"><span class="String">'</span>unshift<span class="String">'</span></span>])<span class="FunctionArgument"> name </span><span class="Storage">=></span>
|
||||
<span class="line-numbers"> 573 </span> method<span class="Keyword">:</span> Array.prototype[name]
|
||||
<span class="line-numbers"> 574 </span> wrapper.prototype[name]<span class="Keyword">:</span> <span class="Storage">=></span>
|
||||
<span class="line-numbers"> 575 </span> method.apply(<span class="Variable">this</span>._wrapped, arguments)
|
||||
<span class="line-numbers"> 576 </span> result(<span class="Variable">this</span>._wrapped, <span class="Variable">this</span>._chain)
|
||||
<span class="line-numbers"> 577 </span>
|
||||
<span class="line-numbers"> 578 </span>
|
||||
<span class="line-numbers"> 579 </span> <span class="Comment"><span class="Comment">#</span> Add all accessor Array functions to the wrapper.</span>
|
||||
<span class="line-numbers"> 580 </span> _.each([<span class="String"><span class="String">'</span>concat<span class="String">'</span></span>, <span class="String"><span class="String">'</span>join<span class="String">'</span></span>, <span class="String"><span class="String">'</span>slice<span class="String">'</span></span>])<span class="FunctionArgument"> name </span><span class="Storage">=></span>
|
||||
<span class="line-numbers"> 581 </span> method<span class="Keyword">:</span> Array.prototype[name]
|
||||
<span class="line-numbers"> 582 </span> wrapper.prototype[name]<span class="Keyword">:</span> <span class="Storage">=></span>
|
||||
<span class="line-numbers"> 583 </span> result(method.apply(<span class="Variable">this</span>._wrapped, arguments), <span class="Variable">this</span>._chain)
|
||||
<span class="line-numbers"> 584 </span>
|
||||
<span class="line-numbers"> 585 </span>
|
||||
<span class="line-numbers"> 586 </span> <span class="Comment"><span class="Comment">#</span> Start chaining a wrapped Underscore object.</span>
|
||||
<span class="line-numbers"> 587 </span> <span class="FunctionName">wrapper.prototype.chain</span><span class="Keyword">:</span> <span class="Storage">=></span>
|
||||
<span class="line-numbers"> 588 </span> <span class="Variable">this</span>._chain<span class="Keyword">:</span> <span class="BuiltInConstant">true</span>
|
||||
<span class="line-numbers"> 589 </span> <span class="Variable">this</span>
|
||||
<span class="line-numbers"> 590 </span>
|
||||
<span class="line-numbers"> 591 </span>
|
||||
<span class="line-numbers"> 592 </span> <span class="Comment"><span class="Comment">#</span> Extracts the result from a wrapped and chained object.</span>
|
||||
<span class="line-numbers"> 593 </span> <span class="FunctionName">wrapper.prototype.value</span><span class="Keyword">:</span> <span class="Storage">=></span> <span class="Variable">this</span>._wrapped
|
||||
</pre>
|
||||
</body>
|
||||
</html>
|
||||
File diff suppressed because it is too large
Load diff
239
index.html
239
index.html
|
|
@ -54,11 +54,11 @@
|
|||
<a href="#lexical_scope">Lexical Scoping and Variable Safety</a><br />
|
||||
<a href="#conditionals">Conditionals, Ternaries, and Conditional Assignment</a><br />
|
||||
<a href="#existence">The Existence Operator</a><br />
|
||||
<a href="#expressions">Everything is an Expression</a><br />
|
||||
<a href="#aliases">Aliases</a><br />
|
||||
<a href="#while">While Loops</a><br />
|
||||
<a href="#comprehensions">Comprehensions (Arrays, Objects, and Ranges)</a><br />
|
||||
<a href="#slice_splice">Array Slicing and Splicing with Ranges</a><br />
|
||||
<a href="#expressions">Everything is an Expression</a><br />
|
||||
<a href="#inheritance">Inheritance, and Calling Super from a Subclass</a><br />
|
||||
<a href="#embedded">Embedded JavaScript</a><br />
|
||||
<a href="#switch">Switch/When/Else</a><br />
|
||||
|
|
@ -166,6 +166,13 @@ cubed_list = (function() {
|
|||
return __c;
|
||||
})();
|
||||
;alert(cubed_list);'>run: cubed_list</button><br class='clear' /></div>
|
||||
|
||||
<p>
|
||||
For a longer CoffeeScript example, check out
|
||||
<a href="documentation/underscore.html">Underscore.coffee</a>, a port
|
||||
of <a href="http://documentcloud.github.com/underscore/">Underscore.js</a>
|
||||
to CoffeeScript, which, when compiled, passes the complete Underscore test suite.
|
||||
</p>
|
||||
|
||||
<h2 id="installation">Installation and Usage</h2>
|
||||
|
||||
|
|
@ -484,121 +491,6 @@ expensive <span class="Keyword">=</span> expensive <span class="Keyword">||</spa
|
|||
}
|
||||
</pre><br class='clear' /></div>
|
||||
|
||||
<p id="expressions">
|
||||
<b class="header">Everything is an Expression (at least, as much as possible)</b>
|
||||
You might have noticed how even though we don't add return statements
|
||||
to CoffeeScript functions, they nonetheless return their final value.
|
||||
The CoffeeScript compiler tries to make sure that all statements in the
|
||||
language can be used as expressions. Watch how the <tt>return</tt> gets
|
||||
pushed down into each possible branch of execution, in the function
|
||||
below.
|
||||
</p>
|
||||
<div class='code'><pre class="idle"><span class="FunctionName">grade</span><span class="Keyword">:</span> <span class="FunctionArgument">student</span> <span class="Storage">=></span>
|
||||
<span class="Keyword">if</span> student.excellent_work
|
||||
<span class="String"><span class="String">"</span>A+<span class="String">"</span></span>
|
||||
<span class="Keyword">else</span> <span class="Keyword">if</span> student.okay_stuff
|
||||
<span class="Keyword">if</span> student.tried_hard <span class="Keyword">then</span> <span class="String"><span class="String">"</span>B<span class="String">"</span></span> <span class="Keyword">else</span> <span class="String"><span class="String">"</span>B-<span class="String">"</span></span>
|
||||
<span class="Keyword">else</span>
|
||||
<span class="String"><span class="String">"</span>C<span class="String">"</span></span>
|
||||
|
||||
eldest<span class="Keyword">:</span> <span class="Keyword">if</span> <span class="Number">24</span> <span class="Keyword">></span> <span class="Number">21</span> <span class="Keyword">then</span> <span class="String"><span class="String">"</span>Liz<span class="String">"</span></span> <span class="Keyword">else</span> <span class="String"><span class="String">"</span>Ike<span class="String">"</span></span>
|
||||
</pre><pre class="idle"><span class="Storage">var</span> eldest, grade;
|
||||
grade <span class="Keyword">=</span> <span class="Storage">function</span> <span class="FunctionName">grade</span>(<span class="FunctionArgument">student</span>) {
|
||||
<span class="Keyword">if</span> (student.excellent_work) {
|
||||
<span class="Keyword">return</span> <span class="String"><span class="String">"</span>A+<span class="String">"</span></span>;
|
||||
} <span class="Keyword">else</span> <span class="Keyword">if</span> (student.okay_stuff) {
|
||||
<span class="Keyword">return</span> student.tried_hard ? <span class="String"><span class="String">"</span>B<span class="String">"</span></span> : <span class="String"><span class="String">"</span>B-<span class="String">"</span></span>;
|
||||
} <span class="Keyword">else</span> {
|
||||
<span class="Keyword">return</span> <span class="String"><span class="String">"</span>C<span class="String">"</span></span>;
|
||||
}
|
||||
};
|
||||
eldest <span class="Keyword">=</span> <span class="Number">24</span> <span class="Keyword">></span> <span class="Number">21</span> ? <span class="String"><span class="String">"</span>Liz<span class="String">"</span></span> : <span class="String"><span class="String">"</span>Ike<span class="String">"</span></span>;
|
||||
</pre><button onclick='javascript: var eldest, grade;
|
||||
grade = function grade(student) {
|
||||
if (student.excellent_work) {
|
||||
return "A+";
|
||||
} else if (student.okay_stuff) {
|
||||
return student.tried_hard ? "B" : "B-";
|
||||
} else {
|
||||
return "C";
|
||||
}
|
||||
};
|
||||
eldest = 24 > 21 ? "Liz" : "Ike";
|
||||
;alert(eldest);'>run: eldest</button><br class='clear' /></div>
|
||||
<p>
|
||||
Because variable declarations occur at the top of scope, assignment can
|
||||
be used within expressions, even for variables that haven't been seen before:
|
||||
</p>
|
||||
<div class='code'><pre class="idle">six<span class="Keyword">:</span> (one<span class="Keyword">:</span> <span class="Number">1</span>) <span class="Keyword">+</span> (two<span class="Keyword">:</span> <span class="Number">2</span>) <span class="Keyword">+</span> (three<span class="Keyword">:</span> <span class="Number">3</span>)
|
||||
</pre><pre class="idle"><span class="Storage">var</span> one, six, three, two;
|
||||
six <span class="Keyword">=</span> (one <span class="Keyword">=</span> <span class="Number">1</span>) <span class="Keyword">+</span> (two <span class="Keyword">=</span> <span class="Number">2</span>) <span class="Keyword">+</span> (three <span class="Keyword">=</span> <span class="Number">3</span>);
|
||||
</pre><button onclick='javascript: var one, six, three, two;
|
||||
six = (one = 1) + (two = 2) + (three = 3);
|
||||
;alert(six);'>run: six</button><br class='clear' /></div>
|
||||
<p>
|
||||
Things that would otherwise be statements in JavaScript, when used
|
||||
as part of an expression in CoffeeScript, are converted into expressions
|
||||
by wrapping them in a closure. This lets you do useful things, like assign
|
||||
the result of a comprehension to a variable:
|
||||
</p>
|
||||
<div class='code'><pre class="idle"><span class="Comment"><span class="Comment">#</span> The first ten global properties.</span>
|
||||
|
||||
globals<span class="Keyword">:</span> (name <span class="Keyword">for</span> property, name <span class="Keyword">in</span> window)[<span class="Number">0</span>...<span class="Number">10</span>]
|
||||
</pre><pre class="idle"><span class="Storage">var</span> __a, __b, __c, globals, name, property;
|
||||
<span class="Comment"><span class="Comment">//</span> The first ten global properties.</span>
|
||||
globals <span class="Keyword">=</span> ((<span class="Storage">function</span>() {
|
||||
__a <span class="Keyword">=</span> <span class="LibraryClassType">window</span>;
|
||||
__b <span class="Keyword">=</span> [];
|
||||
<span class="Keyword">for</span> (name <span class="Keyword">in</span> __a) {
|
||||
<span class="Keyword">if</span> (__a.hasOwnProperty(name)) {
|
||||
property <span class="Keyword">=</span> __a[name];
|
||||
__c <span class="Keyword">=</span> name;
|
||||
__b.<span class="LibraryFunction">push</span>(__c);
|
||||
}
|
||||
}
|
||||
<span class="Keyword">return</span> __b;
|
||||
})()).<span class="LibraryFunction">slice</span>(<span class="Number">0</span>, <span class="Number">10</span>);
|
||||
</pre><button onclick='javascript: var __a, __b, __c, globals, name, property;
|
||||
// The first ten global properties.
|
||||
globals = ((function() {
|
||||
__a = window;
|
||||
__b = [];
|
||||
for (name in __a) {
|
||||
if (__a.hasOwnProperty(name)) {
|
||||
property = __a[name];
|
||||
__c = name;
|
||||
__b.push(__c);
|
||||
}
|
||||
}
|
||||
return __b;
|
||||
})()).slice(0, 10);
|
||||
;alert(globals);'>run: globals</button><br class='clear' /></div>
|
||||
<p>
|
||||
As well as silly things, like passing a <b>try/catch</b> statement directly
|
||||
into a function call:
|
||||
</p>
|
||||
<div class='code'><pre class="idle">alert(
|
||||
<span class="Keyword">try</span>
|
||||
nonexistent <span class="Keyword">/</span> <span class="BuiltInConstant">undefined</span>
|
||||
<span class="Keyword">catch</span> error
|
||||
<span class="String"><span class="String">"</span>The error is: <span class="String">"</span></span> <span class="Keyword">+</span> error
|
||||
)
|
||||
</pre><pre class="idle"><span class="LibraryFunction">alert</span>((<span class="Storage">function</span>() {
|
||||
<span class="Keyword">try</span> {
|
||||
<span class="Keyword">return</span> nonexistent / undefined;
|
||||
} <span class="Keyword">catch</span> (error) {
|
||||
<span class="Keyword">return</span> <span class="String"><span class="String">"</span>The error is: <span class="String">"</span></span> <span class="Keyword">+</span> error;
|
||||
}
|
||||
})());
|
||||
</pre><button onclick='javascript: alert((function() {
|
||||
try {
|
||||
return nonexistent / undefined;
|
||||
} catch (error) {
|
||||
return "The error is: " + error;
|
||||
}
|
||||
})());
|
||||
;'>run</button><br class='clear' /></div>
|
||||
|
||||
<p id="aliases">
|
||||
<b class="header">Aliases</b>
|
||||
Because the <tt>==</tt> operator frequently causes undesirable coercion,
|
||||
|
|
@ -821,6 +713,121 @@ numbers.splice.<span class="LibraryFunction">apply</span>(numbers, [<span class=
|
|||
numbers = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];
|
||||
numbers.splice.apply(numbers, [3, 6 - 3 + 1].concat([-3, -4, -5, -6]));
|
||||
;alert(numbers);'>run: numbers</button><br class='clear' /></div>
|
||||
|
||||
<p id="expressions">
|
||||
<b class="header">Everything is an Expression (at least, as much as possible)</b>
|
||||
You might have noticed how even though we don't add return statements
|
||||
to CoffeeScript functions, they nonetheless return their final value.
|
||||
The CoffeeScript compiler tries to make sure that all statements in the
|
||||
language can be used as expressions. Watch how the <tt>return</tt> gets
|
||||
pushed down into each possible branch of execution, in the function
|
||||
below.
|
||||
</p>
|
||||
<div class='code'><pre class="idle"><span class="FunctionName">grade</span><span class="Keyword">:</span> <span class="FunctionArgument">student</span> <span class="Storage">=></span>
|
||||
<span class="Keyword">if</span> student.excellent_work
|
||||
<span class="String"><span class="String">"</span>A+<span class="String">"</span></span>
|
||||
<span class="Keyword">else</span> <span class="Keyword">if</span> student.okay_stuff
|
||||
<span class="Keyword">if</span> student.tried_hard <span class="Keyword">then</span> <span class="String"><span class="String">"</span>B<span class="String">"</span></span> <span class="Keyword">else</span> <span class="String"><span class="String">"</span>B-<span class="String">"</span></span>
|
||||
<span class="Keyword">else</span>
|
||||
<span class="String"><span class="String">"</span>C<span class="String">"</span></span>
|
||||
|
||||
eldest<span class="Keyword">:</span> <span class="Keyword">if</span> <span class="Number">24</span> <span class="Keyword">></span> <span class="Number">21</span> <span class="Keyword">then</span> <span class="String"><span class="String">"</span>Liz<span class="String">"</span></span> <span class="Keyword">else</span> <span class="String"><span class="String">"</span>Ike<span class="String">"</span></span>
|
||||
</pre><pre class="idle"><span class="Storage">var</span> eldest, grade;
|
||||
grade <span class="Keyword">=</span> <span class="Storage">function</span> <span class="FunctionName">grade</span>(<span class="FunctionArgument">student</span>) {
|
||||
<span class="Keyword">if</span> (student.excellent_work) {
|
||||
<span class="Keyword">return</span> <span class="String"><span class="String">"</span>A+<span class="String">"</span></span>;
|
||||
} <span class="Keyword">else</span> <span class="Keyword">if</span> (student.okay_stuff) {
|
||||
<span class="Keyword">return</span> student.tried_hard ? <span class="String"><span class="String">"</span>B<span class="String">"</span></span> : <span class="String"><span class="String">"</span>B-<span class="String">"</span></span>;
|
||||
} <span class="Keyword">else</span> {
|
||||
<span class="Keyword">return</span> <span class="String"><span class="String">"</span>C<span class="String">"</span></span>;
|
||||
}
|
||||
};
|
||||
eldest <span class="Keyword">=</span> <span class="Number">24</span> <span class="Keyword">></span> <span class="Number">21</span> ? <span class="String"><span class="String">"</span>Liz<span class="String">"</span></span> : <span class="String"><span class="String">"</span>Ike<span class="String">"</span></span>;
|
||||
</pre><button onclick='javascript: var eldest, grade;
|
||||
grade = function grade(student) {
|
||||
if (student.excellent_work) {
|
||||
return "A+";
|
||||
} else if (student.okay_stuff) {
|
||||
return student.tried_hard ? "B" : "B-";
|
||||
} else {
|
||||
return "C";
|
||||
}
|
||||
};
|
||||
eldest = 24 > 21 ? "Liz" : "Ike";
|
||||
;alert(eldest);'>run: eldest</button><br class='clear' /></div>
|
||||
<p>
|
||||
Because variable declarations occur at the top of scope, assignment can
|
||||
be used within expressions, even for variables that haven't been seen before:
|
||||
</p>
|
||||
<div class='code'><pre class="idle">six<span class="Keyword">:</span> (one<span class="Keyword">:</span> <span class="Number">1</span>) <span class="Keyword">+</span> (two<span class="Keyword">:</span> <span class="Number">2</span>) <span class="Keyword">+</span> (three<span class="Keyword">:</span> <span class="Number">3</span>)
|
||||
</pre><pre class="idle"><span class="Storage">var</span> one, six, three, two;
|
||||
six <span class="Keyword">=</span> (one <span class="Keyword">=</span> <span class="Number">1</span>) <span class="Keyword">+</span> (two <span class="Keyword">=</span> <span class="Number">2</span>) <span class="Keyword">+</span> (three <span class="Keyword">=</span> <span class="Number">3</span>);
|
||||
</pre><button onclick='javascript: var one, six, three, two;
|
||||
six = (one = 1) + (two = 2) + (three = 3);
|
||||
;alert(six);'>run: six</button><br class='clear' /></div>
|
||||
<p>
|
||||
Things that would otherwise be statements in JavaScript, when used
|
||||
as part of an expression in CoffeeScript, are converted into expressions
|
||||
by wrapping them in a closure. This lets you do useful things, like assign
|
||||
the result of a comprehension to a variable:
|
||||
</p>
|
||||
<div class='code'><pre class="idle"><span class="Comment"><span class="Comment">#</span> The first ten global properties.</span>
|
||||
|
||||
globals<span class="Keyword">:</span> (name <span class="Keyword">for</span> property, name <span class="Keyword">in</span> window)[<span class="Number">0</span>...<span class="Number">10</span>]
|
||||
</pre><pre class="idle"><span class="Storage">var</span> __a, __b, __c, globals, name, property;
|
||||
<span class="Comment"><span class="Comment">//</span> The first ten global properties.</span>
|
||||
globals <span class="Keyword">=</span> ((<span class="Storage">function</span>() {
|
||||
__a <span class="Keyword">=</span> <span class="LibraryClassType">window</span>;
|
||||
__b <span class="Keyword">=</span> [];
|
||||
<span class="Keyword">for</span> (name <span class="Keyword">in</span> __a) {
|
||||
<span class="Keyword">if</span> (__a.hasOwnProperty(name)) {
|
||||
property <span class="Keyword">=</span> __a[name];
|
||||
__c <span class="Keyword">=</span> name;
|
||||
__b.<span class="LibraryFunction">push</span>(__c);
|
||||
}
|
||||
}
|
||||
<span class="Keyword">return</span> __b;
|
||||
})()).<span class="LibraryFunction">slice</span>(<span class="Number">0</span>, <span class="Number">10</span>);
|
||||
</pre><button onclick='javascript: var __a, __b, __c, globals, name, property;
|
||||
// The first ten global properties.
|
||||
globals = ((function() {
|
||||
__a = window;
|
||||
__b = [];
|
||||
for (name in __a) {
|
||||
if (__a.hasOwnProperty(name)) {
|
||||
property = __a[name];
|
||||
__c = name;
|
||||
__b.push(__c);
|
||||
}
|
||||
}
|
||||
return __b;
|
||||
})()).slice(0, 10);
|
||||
;alert(globals);'>run: globals</button><br class='clear' /></div>
|
||||
<p>
|
||||
As well as silly things, like passing a <b>try/catch</b> statement directly
|
||||
into a function call:
|
||||
</p>
|
||||
<div class='code'><pre class="idle">alert(
|
||||
<span class="Keyword">try</span>
|
||||
nonexistent <span class="Keyword">/</span> <span class="BuiltInConstant">undefined</span>
|
||||
<span class="Keyword">catch</span> error
|
||||
<span class="String"><span class="String">"</span>The error is: <span class="String">"</span></span> <span class="Keyword">+</span> error
|
||||
)
|
||||
</pre><pre class="idle"><span class="LibraryFunction">alert</span>((<span class="Storage">function</span>() {
|
||||
<span class="Keyword">try</span> {
|
||||
<span class="Keyword">return</span> nonexistent / undefined;
|
||||
} <span class="Keyword">catch</span> (error) {
|
||||
<span class="Keyword">return</span> <span class="String"><span class="String">"</span>The error is: <span class="String">"</span></span> <span class="Keyword">+</span> error;
|
||||
}
|
||||
})());
|
||||
</pre><button onclick='javascript: alert((function() {
|
||||
try {
|
||||
return nonexistent / undefined;
|
||||
} catch (error) {
|
||||
return "The error is: " + error;
|
||||
}
|
||||
})());
|
||||
;'>run</button><br class='clear' /></div>
|
||||
|
||||
<p id="inheritance">
|
||||
<b class="header">Inheritance, and Calling Super from a Subclass</b>
|
||||
|
|
|
|||
|
|
@ -47,6 +47,7 @@ rule
|
|||
/* nothing */ { result = Expressions.new }
|
||||
| Terminator { result = Expressions.new }
|
||||
| Expressions { result = val[0] }
|
||||
| Block Terminator { result = val[0] }
|
||||
;
|
||||
|
||||
# Any list of expressions or method body, seperated by line breaks or semis.
|
||||
|
|
|
|||
|
|
@ -227,7 +227,8 @@ module CoffeeScript
|
|||
end
|
||||
end
|
||||
|
||||
# Close up all remaining open blocks.
|
||||
# Close up all remaining open blocks. IF the first token is an indent,
|
||||
# axe it.
|
||||
def close_indentation
|
||||
outdent_token(@indent)
|
||||
end
|
||||
|
|
|
|||
|
|
@ -12,8 +12,8 @@ module CoffeeScript
|
|||
def message
|
||||
line = @value.respond_to?(:line) ? @value.line : "END"
|
||||
line_part = "line #{line}:"
|
||||
id_part = @token_id != @value.inspect ? ", unexpected #{@token_id.downcase}" : ""
|
||||
val_part = ['INDENT', 'OUTDENT'].include?(@token_id) ? '' : " for '#{@value.to_s}'"
|
||||
id_part = @token_id != @value.inspect ? ", unexpected #{@token_id.to_s.downcase}" : ""
|
||||
val_part = ['INDENT', 'OUTDENT'].include?(@token_id) ? '' : " for '#{@value.to_s}'"
|
||||
"#{line_part} syntax error#{val_part}#{id_part}"
|
||||
end
|
||||
alias_method :inspect, :message
|
||||
|
|
|
|||
Loading…
Add table
Reference in a new issue