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    <pre><code>var args = Array.prototype.slice.call(arguments).splice(1); </code></pre> <p>First takes a copy of <code>arguments</code>(*), then removes all but the first item from it (in a non-standard way), and assigns those items being removed to <code>args</code>.</p> <p>The extra array being produced, then altered and thrown away is quite redundant. It would be better to say — as the version in the answer you linked to indeed does:</p> <pre><code>var args = Array.prototype.slice.call(arguments, 1); </code></pre> <p>Partial function application is also a feature of the <code>function.bind</code> method, being standardised by ECMAScript Fifth Edition. Until browsers have implemented it, you can pick up an a fallback JS-native version from the bottom of <a href="https://stackoverflow.com/questions/1558065/access-event-object-in-event-handler/1558289#1558289">this answer</a>.</p> <p>*: <code>array.slice()</code> is the normal idiom for copying an array, and <code>array.slice(1)</code> for taking the tail. It has it be called explicitly through the <code>Array.prototype</code> because <code>arguments</code> is not an Array, even though it looks just like one, so doesn't have the normal array methods. This is another of JavaScript's weird mistakes.</p> <p>You quite often see people using the <code>Array.prototype</code> methods on objects that aren't Arrays; the ECMAScript Third Edition standard goes out of its way to say this is OK to do for the <code>arguments</code> array-like, but <strong>not</strong> that you may also do it on other array-likes that may be host objects, such as NodeList or HTMLCollection. Although you might get away with calling <code>Array.prototype</code> methods on a non-Array in many browsers today, the only place it is actually safe to do so is on <code>arguments</code>.</p>
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    1. POA question about JavaScript's slice and splice methods
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    1. COES5 now explicitly documents many of the Array.prototype methods to work on *any* array-like object, so it should be safe to rely on that continuing to work.
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