title: How to return first 5 objects of Array in Swift?
body: <p>In Swift, is there a clever way of using the higher order methods on Array to return the 5 first objects? 
  The obj-c way of doing it was saving an index, and for-loop through the array incrementing index until it was 5 and returning the new array. Is there a way to do this with <code>filter</code>, <code>map</code> or <code>reduce</code>?</p>