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adding a reduceRight (it's in JS 1.8), and aliasing foldl and foldr

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This commit is contained in:
Jeremy Ashkenas
2009-10-30 09:40:19 -04:00
parent eca085a9d9
commit cb38c6ae63
3 changed files with 47 additions and 7 deletions
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@@ -123,10 +123,14 @@
<b>Collections</b>
<br />
<span class="methods"><a href="#each">each</a>, <a href="#map">map</a>,
<a href="#reduce">reduce</a>, <a href="#detect">detect</a>, <a href="#select">select</a>, <a href="#reject">reject</a>, <a href="#all">all</a>,
<a href="#any">any</a>, <a href="#include">include</a>, <a href="#invoke">invoke</a>, <a href="#pluck">pluck</a>, <a href="#max">max</a>,
<a href="#min">min</a>, <a href="#sortBy">sortBy</a>, <a href="#sortedIndex">sortedIndex</a>, <a href="#toArray">toArray</a>,
<a href="#size">size</a></span>
<a href="#reduce">reduce</a>, <a href="#reduceRight">reduceRight</a>,
<a href="#detect">detect</a>, <a href="#select">select</a>,
<a href="#reject">reject</a>, <a href="#all">all</a>,
<a href="#any">any</a>, <a href="#include">include</a>,
<a href="#invoke">invoke</a>, <a href="#pluck">pluck</a>,
<a href="#max">max</a>, <a href="#min">min</a>,
<a href="#sortBy">sortBy</a>, <a href="#sortedIndex">sortedIndex</a>,
<a href="#toArray">toArray</a>, <a href="#size">size</a></span>
</p>
<p>
@@ -195,7 +199,7 @@ _.map([1, 2, 3], function(num){ return num * 3 });
<p id="reduce">
<b class="header">reduce</b><code>_.reduce(list, memo, iterator, [context])</code>
<span class="alias">Alias: <b>inject</b></span>
<span class="alias">Aliases: <b>inject, foldl</b></span>
<br />
Also known as <b>inject</b> and <b>foldl</b>, <b>reduce</b> boils down a
<b>list</b> of values into a single value. <b>Memo</b> is the initial state
@@ -205,6 +209,19 @@ _.map([1, 2, 3], function(num){ return num * 3 });
<pre>
var sum = _.reduce([1, 2, 3], 0, function(memo, num){ return memo + num });
=&gt; 6
</pre>
<p id="reduceRight">
<b class="header">reduceRight</b><code>_.reduceRight(list, memo, iterator, [context])</code>
<span class="alias">Alias: <b>foldr</b></span>
<br />
The right-associative version of <b>reduce</b>. Delegates to the
JavaScript 1.8 version of <b>reduceRight</b>, if it exists.
</p>
<pre>
var list = [[0, 1], [2, 3], [4, 5]];
var flat = _.reduceRight(list, [], function(a, b) { return a.concat(b); });
=&gt; [4, 5, 2, 3, 0, 1]
</pre>
<p id="detect">