 the same objects.
 
 <code><pre>
-
    a = ["a", "b", "c"]
    b = a.copy()
 


   a === b
=> false

</pre></code>

@name copy

Returns a copy of the array without null and undefined values.

<code><pre>
   [null, undefined, 3, 3, undefined, 5].compact() 
=> [3, 3, 5]
</pre></code>

@name compact
