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Documenting _.once

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This commit is contained in:
Jeremy Ashkenas
2011-03-20 20:02:52 -04:00
parent 39119065dc
commit 065dcbb27b
1 changed files with 16 additions and 1 deletions
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@@ -160,7 +160,7 @@
<span class="methods"><a href="#bind">bind</a>, <a href="#bindAll">bindAll</a>,
<a href="#memoize">memoize</a>, <a href="#delay">delay</a>, <a href="#defer">defer</a>,
<a href="#throttle">throttle</a>, <a href="#debounce">debounce</a>,
<a href="#wrap">wrap</a>, <a href="#compose">compose</a></span>
<a href="#once">once</a>, <a href="#wrap">wrap</a>, <a href="#compose">compose</a></span>
</p>
<p>
@@ -738,6 +738,21 @@ $(window).scroll(throttled);
<pre>
var lazyLayout = _.debounce(calculateLayout, 300);
$(window).resize(lazyLayout);
</pre>
<p id="once">
<b class="header">once</b><code>_.once(function)</code>
<br />
Creates a version of the function that can only be called one time.
Repeated calls to the modified function will have no effect, returning
the value from the original call. Useful for initialization functions,
instead of having to set a boolean flag and then check it later.
</p>
<pre>
var initialize = _.once(createApplication);
initialize();
initialize();
// Application is only created once.
</pre>
<p id="wrap">