From: Gavin Sinclair <gsinclair@...>
Date: 2004-05-08T21:08:59+09:00
Subject: How to get the last 5 elements of an array?

Hi,

I want to extract the last 5 elements of an array 'x'.  I know that x
is an array, but I don't know how many elements it has.  What do you
suggest?

In code, this is what I want.

  def last5(arr)
    # Fill me in.
  end

  last5 []                  # -> []
  last5 [1]                 # -> [1]
  last5 [1,2]               # -> [1,2]
  last5 [1,2,3,4,5,6,7]     # -> [3,4,5,6,7]
  last5 nil                 # -> error

Thanks,
Gavin