From: Martin Stannard <martins@...>
Date: 2004-05-08T21:14:05+09:00
Subject: Re: How to get the last 5 elements of an array?

On Sat, 2004-05-08 at 22:08, 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
> 
> Thanks,
> Gavin
> 

Hi Gavin,

ruby -e 'p [1, 2, 3, 4, 5, 6, 7, 8, 9, 10][-5..-1]'

Martin