title: Underscore forEach index?
body: <p>I have an object that contains the follow structure</p>
  
  <pre><code>{
  Apples: Array[1],
  Mangos: Array[2],
  Oranges: Array[5],
  Bananas: Array[11]
  }
  </code></pre>
  
  <p>These values are extracted using a </p>
  
  <pre><code>_.forEach(contents, function(values, key) {
  
  }
  </code></pre>
  
  <p>Where the <code>key = apples</code> and the <code>values</code> would be the array. I am wondering how I can get the current index within this <code>foreach</code> loop ? </p>
  
  <p>i.e. so I get <code>1,2,3,4</code> ? There may not be a way to do this other than to push them to an array ?</p>