From: Robert Dober <robert.dober@...>
Date: 2009-07-29T21:11:45+09:00
Subject: Re: previous value in array block

On Wed, Jul 29, 2009 at 10:50 AM, Xavier Noria<fxn@hashref.com> wrote:
> each_cons seems natural here:
>
> require 'enumerator'
>
> a = [1, 3, 3, 2]
> b = a[0, 1]
>
> a.each_cons(2) { |x, y| b << y - x }
and purely functional
( [0] + a ).each_cons( 2 ).map{ |x,y| y -x }
or with Tom's map arity trick implemented
( [0] + a ).map{ | x, y | y - x }
>
>



-- 
Toutes les grandes personnes ont d’abord été des enfants, mais peu
d’entre elles s’en souviennent.

All adults have been children first, but not many remember.

[Antoine de Saint-Exupéry]