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Adding an existential infix operator example.

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Jeremy Ashkenas 2010-12-11 19:44:11 -05:00
parent 9f56c92497
commit 2ac5ee4062
4 changed files with 101 additions and 94 deletions
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4
documentation/coffee/existence.coffee
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@ -1,6 +1,8 @@
solipsism = true if mind? and not world?
speed ?= 140
speed ?= 75
footprints = yeti ? "bear"

2
documentation/index.html.erb
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@ -608,7 +608,7 @@ coffee --bare --print --stdio</pre>
It can also be used for safer conditional assignment than <tt>||=</tt>
provides, for cases where you may be handling numbers or strings.
</p>
<%= code_for('existence', 'speed') %>
<%= code_for('existence', 'footprints') %>
<p>
The accessor variant of the existential operator <tt>?.</tt> can be used to soak
up null references in a chain of properties. Use it instead

5
documentation/js/existence.js
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@ -1,5 +1,6 @@
var solipsism;
var footprints, solipsism;
if ((typeof mind != "undefined" && mind !== null) && !(typeof world != "undefined" && world !== null)) {
solipsism = true;
}
typeof speed != "undefined" && speed !== null ? speed : speed = 140;
typeof speed != "undefined" && speed !== null ? speed : speed = 75;
footprints = typeof yeti != "undefined" && yeti !== null ? yeti : "bear";

16
index.html
View file

@ -1111,22 +1111,26 @@ globals = (function() {
</p>
<div class='code'><pre class="idle">solipsism <span class="Keyword">=</span> <span class="BuiltInConstant">true</span> <span class="Keyword">if</span> mind<span class="Keyword">?</span> <span class="Keyword">and</span> <span class="Keyword">not</span> world<span class="Keyword">?</span>
speed <span class="Keyword">?</span><span class="Keyword">=</span> <span class="Number">140</span>
speed <span class="Keyword">?</span><span class="Keyword">=</span> <span class="Number">75</span>
footprints <span class="Keyword">=</span> yeti <span class="Keyword">?</span> <span class="String"><span class="String">&quot;</span>bear<span class="String">&quot;</span></span>
</pre><pre class="idle"><span class="Storage">var</span> solipsism;
</pre><pre class="idle"><span class="Storage">var</span> footprints, solipsism;
<span class="Keyword">if</span> ((<span class="Keyword">typeof</span> mind <span class="Keyword">!</span><span class="Keyword">=</span> <span class="String"><span class="String">&quot;</span>undefined<span class="String">&quot;</span></span> <span class="Keyword">&amp;</span><span class="Keyword">&amp;</span> mind <span class="Keyword">!</span><span class="Keyword">==</span> <span class="BuiltInConstant">null</span>) <span class="Keyword">&amp;</span><span class="Keyword">&amp;</span> <span class="Keyword">!</span>(<span class="Keyword">typeof</span> world <span class="Keyword">!</span><span class="Keyword">=</span> <span class="String"><span class="String">&quot;</span>undefined<span class="String">&quot;</span></span> <span class="Keyword">&amp;</span><span class="Keyword">&amp;</span> world <span class="Keyword">!</span><span class="Keyword">==</span> <span class="BuiltInConstant">null</span>)) {
solipsism <span class="Keyword">=</span> <span class="BuiltInConstant">true</span>;
}
<span class="Keyword">typeof</span> speed <span class="Keyword">!</span><span class="Keyword">=</span> <span class="String"><span class="String">&quot;</span>undefined<span class="String">&quot;</span></span> <span class="Keyword">&amp;</span><span class="Keyword">&amp;</span> speed <span class="Keyword">!</span><span class="Keyword">==</span> <span class="BuiltInConstant">null</span> ? speed : speed <span class="Keyword">=</span> <span class="Number">140</span>;
</pre><button onclick='javascript: var solipsism;
<span class="Keyword">typeof</span> speed <span class="Keyword">!</span><span class="Keyword">=</span> <span class="String"><span class="String">&quot;</span>undefined<span class="String">&quot;</span></span> <span class="Keyword">&amp;</span><span class="Keyword">&amp;</span> speed <span class="Keyword">!</span><span class="Keyword">==</span> <span class="BuiltInConstant">null</span> ? speed : speed <span class="Keyword">=</span> <span class="Number">75</span>;
footprints <span class="Keyword">=</span> <span class="Keyword">typeof</span> yeti <span class="Keyword">!</span><span class="Keyword">=</span> <span class="String"><span class="String">&quot;</span>undefined<span class="String">&quot;</span></span> <span class="Keyword">&amp;</span><span class="Keyword">&amp;</span> yeti <span class="Keyword">!</span><span class="Keyword">==</span> <span class="BuiltInConstant">null</span> ? yeti : <span class="String"><span class="String">&quot;</span>bear<span class="String">&quot;</span></span>;
</pre><button onclick='javascript: var footprints, solipsism;
if ((typeof mind != "undefined" && mind !== null) && !(typeof world != "undefined" && world !== null)) {
solipsism = true;
}
typeof speed != "undefined" && speed !== null ? speed : speed = 140;;alert(speed);'>run: speed</button><br class='clear' /></div>
typeof speed != "undefined" && speed !== null ? speed : speed = 75;
footprints = typeof yeti != "undefined" && yeti !== null ? yeti : "bear";;alert(footprints);'>run: footprints</button><br class='clear' /></div>
<p>
The accessor variant of the existential operator <tt>?.</tt> can be used to soak
up null references in a chain of properties. Use it instead
@ -1910,7 +1914,7 @@ task(<span class="String"><span class="String">'</span>build:parser<span class="
asynchronous exceptions. Using <tt>--watch</tt> now prints timestamps as
files are compiled. Fixed some accidentally-leaking variables within
plucked closure-loops. Constructors now maintain their declaration
location within a class body.
location within a class body. Dynamic object keys were removed.
Nested classes are now supported. Fixes execution context for naked
splatted functions. Bugfix for inversion of chained comparisons.
Chained class instantiation now works properly with splats.