last(...) public

Returns the last element(s) of self. If the array is empty, the first form returns nil. 

   [ "w", "x", "y", "z" ].last   #=> "z"
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April 16, 2009
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Extracting the Last Element

To remove the last element from the Array, use pop:

array = [ 1, 2, 3 ]           # => [ 1, 2, 3 ]
array.last                    # => 3
array                         # => [ 1, 2, 3 ]
array.pop                     # => 3
array                         # => [ 1, 2 ]
August 18, 2008
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Last element of an array alternative

You can also access the last element of an array with -1

[ "w", "x", "y", "z" ][-1]  #=> "z"