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pulling Evgeniy Dolzhenko's patch to add _.tap, with tests

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This commit is contained in:
Jeremy Ashkenas
2009-12-11 09:25:20 -05:00
parent c17879453a
commit d49196f2e7
3 changed files with 39 additions and 2 deletions
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18
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@@ -206,7 +206,7 @@ _(lyrics).chain()
<b>Objects</b>
<br />
<span class="methods"><a href="#keys">keys</a>, <a href="#values">values</a>,
<a href="#functions">functions</a>, <a href="#extend">extend</a>, <a href="#clone">clone</a>,
<a href="#functions">functions</a>, <a href="#extend">extend</a>, <a href="#clone">clone</a>, <a href="#tap">tap</a>,
<a href="#isEqual">isEqual</a>, <a href="#isEmpty">isEmpty</a>, <a href="#isElement">isElement</a>,
<a href="#isArray">isArray</a>, <a href="#isArguments">isArguments</a>, <a href="#isFunction">isFunction</a>, <a href="#isString">isString</a>,
<a href="#isNumber">isNumber</a>, <a href="#isDate">isDate</a>, <a href="#isRegExp">isRegExp</a>
@@ -766,6 +766,22 @@ _.extend({name : 'moe'}, {age : 50});
<pre>
_.clone({name : 'moe'});
=&gt; {name : 'moe'};
</pre>
<p id="tap">
<b class="header">tap</b><code>_.tap(object, interceptor)</code>
<br />
Invokes <b>interceptor</b> with the <b>object</b>, and then returns <b>object</b>.
The primary purpose of this method is to "tap into" a method chain, in order to perform operations on intermediate results within the chain.
</p>
<pre>
_([1,2,3,200]).chain().
select(function(num) { return num % 2 == 0; }).
tap(console.log).
map(function(num) { return num * num }).
value();
=&gt; [2, 200]
=&gt; [4, 40000]
</pre>
<p id="isEqual">