From: Logan Capaldo <logancapaldo@...>
Date: 2006-03-07T07:00:18+09:00
Subject: Re: What is the best way to iterate through two containers of the same length?


On Mar 6, 2006, at 4:48 PM, Mark Watson wrote:

> If I have two containers c1 and c2 of the same length, what is the
> proper "Ruby way" to do this:
>
> c1.length.times {|i|
>   # access c1[i], c2[i]
> }
>
> I like that Ruby container classes provide their own iterators, but
> what I would like to have is something like:
>
> (c1,c2).each {|x1,x2| .... }
>
> I thought of writing my own iterator class so that I could do  
> something
> like:
>
> Iterator.new(c1,c2).each {|x1,x2| .... }
>
> but that looks clumsy and inefficient.
>
> I am transitioning to using mostly Ruby (moving away from Java, Lisp,
> and Smalltalk) and I would like to use the proper Ruby idioms.
>
>

Well there is zip:
irb(main):001:0> [1,2,3].zip([4,5,6]) do |a, b|
irb(main):002:1* puts "#{a} #{b}"
irb(main):003:1> end
1 4
2 5
3 6
=> nil