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documenting 'when', a bit.

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Jeremy Ashkenas 2011-01-30 17:10:50 -05:00
parent 1f2f55bea3
commit 49d9eb687d
4 changed files with 31 additions and 28 deletions
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6
documentation/index.html.erb
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@ -479,11 +479,13 @@ Expressions
over arrays, objects, and ranges. Comprehensions replace (and compile into)
<b>for</b> loops, with optional guard clauses and the value of the current array index.
Unlike for loops, array comprehensions are expressions, and can be returned
and assigned. They should be able to handle most places where you otherwise
would use a loop, <b>each</b>/<b>forEach</b>, <b>map</b>, or <b>select</b>/<b>filter</b>.
and assigned.
</p>
<%= code_for('array_comprehensions') %>
<p>
Comprehensions should be able to handle most places where you otherwise
would use a loop, <b>each</b>/<b>forEach</b>, <b>map</b>, or <b>select</b>/<b>filter</b>:
<tt>evens = (i for i in list when i % 2 is 0)</tt><br />
If you know the start and end of your loop, or would like to step through
in fixed-size increments, you can use a range to specify the start and
end of your comprehension.

12
documentation/js/do.js
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@ -1,10 +1,10 @@
var fileName, _fn, _i, _len;
_fn = function(fileName) {
return fs.readFile(fileName, function(err, contents) {
return compile(fileName, contents.toString());
var filename, _fn, _i, _len;
_fn = function(filename) {
return fs.readFile(filename, function(err, contents) {
return compile(filename, contents.toString());
});
};
for (_i = 0, _len = list.length; _i < _len; _i++) {
fileName = list[_i];
_fn(fileName);
filename = list[_i];
_fn(filename);
}

2
documentation/js/soaks.js
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@ -1,2 +1,2 @@
var zip, _ref;
zip = typeof lottery.drawWinner === "function" ? (_ref = lottery.drawWinner().address) != null ? _ref.zipcode : void 0 : void 0;
zip = typeof lottery.drawWinner == "function" ? (_ref = lottery.drawWinner().address) != null ? _ref.zipcode : void 0 : void 0;

39
index.html
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@ -752,8 +752,7 @@ alert("The Field: " + rest);;'>run</div><br class='clear' /></div>
over arrays, objects, and ranges. Comprehensions replace (and compile into)
<b>for</b> loops, with optional guard clauses and the value of the current array index.
Unlike for loops, array comprehensions are expressions, and can be returned
and assigned. They should be able to handle most places where you otherwise
would use a loop, <b>each</b>/<b>forEach</b>, <b>map</b>, or <b>select</b>/<b>filter</b>.
and assigned.
</p>
<div class='code'><pre class="idle"><span class="Comment"><span class="Comment">#</span> Eat lunch.</span>
eat food <span class="Keyword">for</span> food <span class="Keyword">in</span> [<span class="String"><span class="String">'</span>toast<span class="String">'</span></span>, <span class="String"><span class="String">'</span>cheese<span class="String">'</span></span>, <span class="String"><span class="String">'</span>wine<span class="String">'</span></span>]
@ -765,6 +764,9 @@ _ref <span class="Keyword">=</span> [<span class="String"><span class="String">'
}
</pre><script>window.example9 = "# Eat lunch.\neat food for food in ['toast', 'cheese', 'wine']\n"</script><div class='minibutton load' onclick='javascript: loadConsole(example9);'>load</div><br class='clear' /></div>
<p>
Comprehensions should be able to handle most places where you otherwise
would use a loop, <b>each</b>/<b>forEach</b>, <b>map</b>, or <b>select</b>/<b>filter</b>:
<tt>evens = (i for i in list when i % 2 is 0)</tt><br />
If you know the start and end of your loop, or would like to step through
in fixed-size increments, you can use a range to specify the start and
end of your comprehension.
@ -911,21 +913,21 @@ lyrics = (function() {
provides the <tt>do</tt> keyword, which immediately invokes a passed function,
forwarding any arguments.
</p>
<div class='code'><pre class="idle"><span class="Keyword">for</span> fileName <span class="Keyword">in</span> list
<span class="Keyword">do</span> <span class="FunctionArgument">(fileName)</span> <span class="Storage">-&gt;</span>
fs.readFile fileName, <span class="FunctionArgument">(err, contents)</span> <span class="Storage">-&gt;</span>
compile fileName, contents.toString()
</pre><pre class="idle"><span class="Storage">var</span> fileName, _fn, _i, _len;
<span class="FunctionName">_fn</span> = <span class="Storage">function</span>(<span class="FunctionArgument">fileName</span>) {
<span class="Keyword">return</span> fs.readFile(fileName, <span class="Storage">function</span>(err, contents) {
<span class="Keyword">return</span> <span class="LibraryFunction">compile</span>(fileName, contents.<span class="LibraryFunction">toString</span>());
<div class='code'><pre class="idle"><span class="Keyword">for</span> filename <span class="Keyword">in</span> list
<span class="Keyword">do</span> <span class="FunctionArgument">(filename)</span> <span class="Storage">-&gt;</span>
fs.readFile filename, <span class="FunctionArgument">(err, contents)</span> <span class="Storage">-&gt;</span>
compile filename, contents.toString()
</pre><pre class="idle"><span class="Storage">var</span> filename, _fn, _i, _len;
<span class="FunctionName">_fn</span> = <span class="Storage">function</span>(<span class="FunctionArgument">filename</span>) {
<span class="Keyword">return</span> fs.readFile(filename, <span class="Storage">function</span>(err, contents) {
<span class="Keyword">return</span> <span class="LibraryFunction">compile</span>(filename, contents.<span class="LibraryFunction">toString</span>());
});
};
<span class="Keyword">for</span> (_i <span class="Keyword">=</span> <span class="Number">0</span>, _len <span class="Keyword">=</span> list.<span class="LibraryConstant">length</span>; _i <span class="Keyword">&lt;</span> _len; _i<span class="Keyword">++</span>) {
fileName <span class="Keyword">=</span> list[_i];
_fn(fileName);
filename <span class="Keyword">=</span> list[_i];
_fn(filename);
}
</pre><script>window.example13 = "for fileName in list\n do (fileName) ->\n fs.readFile fileName, (err, contents) ->\n compile fileName, contents.toString()"</script><div class='minibutton load' onclick='javascript: loadConsole(example13);'>load</div><br class='clear' /></div>
</pre><script>window.example13 = "for filename in list\n do (filename) ->\n fs.readFile filename, (err, contents) ->\n compile filename, contents.toString()"</script><div class='minibutton load' onclick='javascript: loadConsole(example13);'>load</div><br class='clear' /></div>
<p>
<span id="slices" class="bookmark"></span>
@ -1220,7 +1222,7 @@ footprints = typeof yeti != "undefined" && yeti !== null ? yeti : "bear";;alert(
</p>
<div class='code'><pre class="idle">zip <span class="Keyword">=</span> lottery.drawWinner<span class="Keyword">?</span>().address<span class="Keyword">?</span>.zipcode
</pre><pre class="idle"><span class="Storage">var</span> zip, _ref;
zip <span class="Keyword">=</span> <span class="Keyword">typeof</span> lottery.drawWinner <span class="Keyword">===</span> <span class="String"><span class="String">&quot;</span>function<span class="String">&quot;</span></span> ? (_ref <span class="Keyword">=</span> lottery.drawWinner().address) <span class="Keyword">!</span><span class="Keyword">=</span> <span class="BuiltInConstant">null</span> ? _ref.zipcode : <span class="Storage">void</span> <span class="Number">0</span> : <span class="Storage">void</span> <span class="Number">0</span>;
zip <span class="Keyword">=</span> <span class="Keyword">typeof</span> lottery.drawWinner <span class="Keyword">==</span> <span class="String"><span class="String">&quot;</span>function<span class="String">&quot;</span></span> ? (_ref <span class="Keyword">=</span> lottery.drawWinner().address) <span class="Keyword">!</span><span class="Keyword">=</span> <span class="BuiltInConstant">null</span> ? _ref.zipcode : <span class="Storage">void</span> <span class="Number">0</span> : <span class="Storage">void</span> <span class="Number">0</span>;
</pre><script>window.example22 = "zip = lottery.drawWinner?().address?.zipcode\n"</script><div class='minibutton load' onclick='javascript: loadConsole(example22);'>load</div><br class='clear' /></div>
<p>
Soaking up nulls is similar to Ruby's
@ -1918,6 +1920,10 @@ task(<span class="String"><span class="String">'</span>build:parser<span class="
<b>yeungda</b>'s <a href="http://yeungda.github.com/coffeescript-idea/">coffeescript-idea</a>
&mdash; a plugin for IntelliJ IDEA and RubyMine providing syntax highlighting.
</li>
<li>
<b>dhotson</b>'s <a href="https://github.com/dhotson/coffeescript-jedit">coffeescript-jedit</a>
&mdash; which provides syntax highlighting support in jEdit.
</li>
<li>
<b>mattly</b>'s <a href="http://github.com/mattly/rack-coffee">rack-coffee</a>
&mdash; a small Rack middleware for serving CoffeeScript files as
@ -1943,11 +1949,6 @@ task(<span class="String"><span class="String">'</span>build:parser<span class="
&mdash; a custom filter for rendering CoffeeScript inline within
<a href="http://haml-lang.com/">HAML</a> templates.
</li>
<li>
<b>chrislloyd</b>'s <a href="http://github.com/chrislloyd/roast">Roast</a>
&mdash; a CoffeeScript compiler plug-in that allows you to include external
source files.
</li>
<li>
<b>andrzejsliwa</b>'s <a href="http://github.com/andrzejsliwa/coffeeapp">CoffeeApp</a>
&mdash; a CoffeeScript wrapper for CouchApps, web applications served