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(breaking change) moving _.reduce's method signature to that of ECMA5. _.reduce(obj, iterator, memo). Updated tests and docs.

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This commit is contained in:
Jeremy Ashkenas
2010-07-15 09:50:55 -04:00
parent e81a2ec516
commit 9827f87611
4 changed files with 28 additions and 22 deletions
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12
index.html
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@@ -216,10 +216,10 @@ var lyrics = [
_(lyrics).chain()
.map(function(line) { return line.words.split(' '); })
.flatten()
.reduce({}, function(counts, word) {
.reduce(function(counts, word) {
counts[word] = (counts[word] || 0) + 1;
return counts;
}).value();
}, {}).value();
=&gt; {lumberjack : 2, all : 4, night : 2 ... }</pre>
@@ -261,7 +261,7 @@ _.map([1, 2, 3], function(num){ return num * 3 });
=&gt; [3, 6, 9]</pre>
<p id="reduce">
<b class="header">reduce</b><code>_.reduce(list, memo, iterator, [context])</code>
<b class="header">reduce</b><code>_.reduce(list, iterator, memo, [context])</code>
<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
@@ -270,12 +270,12 @@ _.map([1, 2, 3], function(num){ return num * 3 });
<b>iterator</b>.
</p>
<pre>
var sum = _.reduce([1, 2, 3], 0, function(memo, num){ return memo + num });
var sum = _.reduce([1, 2, 3], function(memo, num){ return memo + num }, 0);
=&gt; 6
</pre>
<p id="reduceRight">
<b class="header">reduceRight</b><code>_.reduceRight(list, memo, iterator, [context])</code>
<b class="header">reduceRight</b><code>_.reduceRight(list, iterator, memo, [context])</code>
<span class="alias">Alias: <b>foldr</b></span>
<br />
The right-associative version of <b>reduce</b>. Delegates to the
@@ -285,7 +285,7 @@ var sum = _.reduce([1, 2, 3], 0, function(memo, num){ return memo + num });
</p>
<pre>
var list = [[0, 1], [2, 3], [4, 5]];
var flat = _.reduceRight(list, [], function(a, b) { return a.concat(b); });
var flat = _.reduceRight(list, function(a, b) { return a.concat(b); }, []);
=&gt; [4, 5, 2, 3, 0, 1]
</pre>