From: Stefano Crocco <stefano.crocco@...>
Date: 2007-09-18T00:25:45+09:00
Subject: Re: group array elements in groups of two

Alle luned狸 17 settembre 2007, Emmanuel Oga ha scritto:
> A better way to do this? :
>
> arr= [1, 2, 3, 4, 5, 6, 7, 8]
> new= []
> while !arr.empty?
>   elem1, elem2= arr.pop, arr.pop
>   new << [elem2, elem1];
> end
> new.reverse!
>
> new= [[1, 2], [3, 4], [5, 6], [7, 8]]
>
> Thanks!

Use each_slice:
  
  require 'enumerator'
  arr = [1, 2, 3, 4, 5, 6, 7, 8]
  new = []
  arr.each_slice(2){|s| new << s}

or each_slice, enum_for an inject:

  require 'enumerator'
  arr = [1, 2, 3, 4, 5, 6, 7, 8]
  new = arr.enum_for(:each_slice , 2).inject([]){|res, c| res << c}

I hope this helps

Stefano