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    <p>This is a new feature of JavaScript 1.7 called <a href="https://developer.mozilla.org/en/New_in_javascript_1.7#Destructuring_assignment_(Merge_into_own_page.2Fsection)" rel="noreferrer">Destructuring assignment</a>:</p> <blockquote> <p>Destructuring assignment makes it possible to extract data from arrays or objects using a syntax that mirrors the construction of array and object literals.</p> <p>The object and array literal expressions provide an easy way to create ad-hoc packages of data. Once you've created these packages of data, you can use them any way you want to. You can even return them from functions.</p> <p>One particularly useful thing you can do with destructuring assignment is to read an entire structure in a single statement, although there are a number of interesting things you can do with them, as shown in the section full of examples that follows.</p> <p>You can use destructuring assignment, for example, to swap values:</p> <pre><code>var a = 1; var b = 3; [a, b] = [b, a]; </code></pre> <p>This capability is similar to features present in languages such as Perl and Python.</p> </blockquote> <p>Unfortunately, according to <a href="http://en.wikipedia.org/wiki/JavaScript#Versions" rel="noreferrer">this table of versions</a>, JavaScript 1.7 has not been implemented in Chrome. But it should be there in:</p> <ul> <li>FireFox 2.0+</li> <li>IE 9</li> <li>Opera 11.50. </li> </ul> <p>Try it for yourself in this jsfiddle: <a href="http://jsfiddle.net/uBReg/" rel="noreferrer">http://jsfiddle.net/uBReg/</a></p> <p>I tested this on Chrome (failed), IE 8 (failed), and FireFox 5 (which worked, per the wiki table).</p>
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    1. POJavascript. Assign array values to multiple variables?
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    1. CODestructuring is (likely) [coming as an official language feature](http://wiki.ecmascript.org/doku.php?id=harmony:destructuring) in the next version of ECMAScript, so Google Chrome will certainly get there assuming the proposal sticks.
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    2. COThat would be great; there are some exciting features in JavaScript 1.7+ ... its unfortunate that they cannot be used for "real-world" applications at the moment due to these browser incompatibilities.
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    3. COok. Do you think there is more compact and clear way to do the same than a = arr.shift()?
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