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copied!<p>Yes, this is certainly possible. <code>apply</code> returns the result of a function, so it's not applicable here, however, <code>bind</code> fits.</p> <p>You may wish to read the <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/bind?redirectlocale=en-US&redirectslug=JavaScript%2FReference%2FGlobal_Objects%2FFunction%2Fbind" rel="nofollow">MDN docs for Bind</a>.</p> <p>Since bind works in order, if you alter the order of your parameters this is nice and elegant. Let's change the signature of <code>sortby</code> to: <code>function sortby(prop, a, b) {</code>. Now we can easily tell bind to fix the first parameter:</p> <pre><code>someArray.sort(sortby.bind(undefined, 'propertyname')); </code></pre> <p>Note the <code>undefined</code>. The first parameter to <code>bind</code> (as per the docs) is a new <code>this</code> reference. Since we don't use it, we'll pass <code>undefined</code> to say that we don't want to change the context. The next parameter tells bind to create a function which passes a value of 'propertyname' as the first argument to <code>sortby</code>. This gives us a <em>partial function application</em>; returning a function which takes two parameters, calling <code>sortby</code> with the first value that we've already given it, then the two parameters. This function is passed to <code>sort</code>, calling it as it needs.</p> <p>Manually interpreting the call to bind, it gives you something like this:</p> <pre><code>someArray.sort(function (a, b) { sortby.apply(this, 'propertyname', a, b); }); </code></pre>

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