Understanding jQuery's .eq()
<p>jQuery's <code>.eq()</code> is:</p>

<pre><code>eq: function( i ) {
    return i === -1 ?
        this.slice( i ) :
        this.slice( i, +i + 1 );
},
</code></pre>

<p>What is the point of the first <code>+</code> in <code>+i + 1</code>?</p>
