What do I have to do with the variable count in order to pass this tutorial about JavaScript function scopes?
<p>The <a href="http://nathansjslessons.appspot.com/lesson?id=1055&amp;lang=en" rel="nofollow">tutorial</a> says:</p>

<blockquote>
  <p>Define a function named callFunc that takes one argument, a function
  f. It should return an array containing the values f(0), f(0), f(1),
  f(1). You can only call f twice.</p>
</blockquote>

<p>This is what the tutorial gives:</p>

<pre><code>var count = 0;
var f = function (x) {
    count += 1;
    return x + 2;
};


var callFunc = function (f) {

};
</code></pre>

<p>I have no idea how to use <code>count</code> to pass this tutorial.
Any suggestions?</p>
