Is Minus Zero some sort of JavaScript performance trick?
<p>Looking in the jQuery core I found the following code convention:</p>

<pre><code>nth: function(elem, i, match){
    return match[3] - 0 === i;
},
</code></pre>

<p>And I was really curious about the snippet <code>match[3] - 0</code></p>

<p>Hunting around for '-0' on google isn't too productive, and a search for 'minus zero' brings back a reference to a Bob Dylan song.</p>

<p>So, can anyone tell me. Is this some sort of performance trick, or is there a reason for doing this rather than a <code>parseInt</code> or <code>parseFloat</code>?</p>

<p>Thanks</p>
