From: Trans <transfire@...>
Date: 2006-08-06T04:20:54+09:00
Subject: Re: Iterating over an array n element at a time


Kim Pedersen wrote:
> Is there an elegant way to iterate over an array n elements at a time?
> e.g. something like...
>
> a = [1,1,1,2,2,2,3,3,3]
>
> a.each(3) do |x,y,z|
>     print x,y,z,"\n"
> end
>
> prints...
> 111
> 222
> 333
>
> //kim

enumerator is probably better since it is built-in, but...

  require 'facet/enumerable/each_by'
  a = [1,1,1,2,2,2,3,3,3]
  a.each_by(3) { |x,y,z| print x,y,z,"\n" }
  111
  222
  333

But why not have Ruby fill those arguments out automatically? This
already does:

  a = [[1,1,1],[2,2,2],[3,3,3]]
  a.each { |x,y,z| print x,y,z,"\n" }

So couldn't some "slurping" indicator be used?

  a = [1,1,1,2,2,2,3,3,3]
  a.each { |(x,y,z)| print x,y,z,"\n" }

Or something.

T.