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Underscore 1.0.4, with _.memoize

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Jeremy Ashkenas
2010-06-22 09:21:03 -04:00
parent d62906672b
commit 29e2c832bc
6 changed files with 68 additions and 29 deletions
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@@ -108,18 +108,16 @@
<h2>Downloads <i style="padding-left: 12px; font-size:12px;">(Right-click, and use "Save As")</i></h2>
<p>
<table>
<tr>
<td><a href="underscore.js">Development Version (1.0.3)</a></td>
<td><i>24kb, Uncompressed with Comments</i></td>
</tr>
<tr>
<td><a href="underscore-min.js">Production Version (1.0.3)</a></td>
<td><i>2.9kb, Packed and Gzipped</i></td>
</tr>
</table>
</p>
<table>
<tr>
<td><a href="underscore.js">Development Version (1.0.4)</a></td>
<td><i>24kb, Uncompressed with Comments</i></td>
</tr>
<tr>
<td><a href="underscore-min.js">Production Version (1.0.4)</a></td>
<td><i>2.9kb, Packed and Gzipped</i></td>
</tr>
</table>
<h2>Table of Contents</h2>
@@ -144,15 +142,16 @@
<br />
<span class="methods"><a href="#first">first</a>, <a href="#rest">rest</a>, <a href="#last">last</a>,
<a href="#compact">compact</a>, <a href="#flatten">flatten</a>, <a href="#without">without</a>, <a href="#uniq">uniq</a>,
<a href="#intersect">intersect</a>, <a href="#zip">zip</a>, <a href="#indexOf">indexOf</a></span>,
<a href="#intersect">intersect</a>, <a href="#zip">zip</a>, <a href="#indexOf">indexOf</a>,
<a href="#lastIndexOf">lastIndexOf</a>, <a href="#range">range</a></span>
</p>
<p>
<b>Functions</b>
<br />
<span class="methods"><a href="#bind">bind</a>, <a href="#bindAll">bindAll</a>, <a href="#delay">delay</a>,
<a href="#defer">defer</a>, <a href="#wrap">wrap</a></span>, <a href="#compose">compose</a></span>
<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="#wrap">wrap</a>, <a href="#compose">compose</a></span>
</p>
<p>
@@ -173,7 +172,7 @@
<br />
<span class="methods"><a href="#noConflict">noConflict</a>,
<a href="#identity">identity</a>, <a href="#times">times</a>,
<a href="#breakLoop">breakLoop</a></span>, <a href="#mixin">mixin</a></span>,
<a href="#breakLoop">breakLoop</a>, <a href="#mixin">mixin</a>,
<a href="#uniqueId">uniqueId</a>, <a href="#template">template</a></span>
</p>
@@ -652,6 +651,21 @@ var buttonView = {
_.bindAll(buttonView);
jQuery('#underscore_button').bind('click', buttonView.onClick);
=&gt; When the button is clicked, this.label will have the correct value...
</pre>
<p id="memoize">
<b class="header">memoize</b><code>_.memoize(function, [hashFunction])</code>
<br />
Memoizes a given <b>function</b> by caching the computed result. Useful
for speeding up slow-running computations. If passed an optional
<b>hashFunction</b>, it will be used to compute the hash key for storing
the result, based on the arguments to the original function.
</p>
<pre>
var fibonacci = function(n) {
return n &lt; 2 ? n : fibonacci(n - 1) + fibonacci(n - 2);
};
var fastFibonacci = _.memoize(fibonacci);
</pre>
<p id="delay">
@@ -1136,6 +1150,12 @@ _([1, 2, 3]).value();
<h2>Change Log</h2>
<p>
<b class="header">1.0.4</b><br />
Andri Möll contributed the <tt>_.memoize</tt> function, which can be
used to speed up expensive repeated computations by caching the results.
</p>
<p>
<b class="header">1.0.3</b><br />
Patch that makes <tt>_.isEqual</tt> return <tt>false</tt> if any property