From: Harry Ohlsen <harryo@...>
Date: 2004-05-08T21:18:30+09:00
Subject: Re: How to get the last 5 elements of an array?

Gavin Sinclair wrote:

>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
>  
>
How about ...

  def last5(arr)
     if arr.length < 5
        arr.dup
      else
        arr[-5, 5]
      end
   end