From: Christopher Swasey <christopher.swasey@...>
Date: 2008-03-02T07:42:53+09:00
Subject: Re: counting in for .. in ..

On 3/1/08, Daniel Liebig <d.liebig@wevin.de> wrote:
> Hi,
>
>  i'm doing my first steps in ruby (on rails) and often use things like
>
>  for thing in @several_things
>   print thing
>  end
>
>  Ok so far, looks great :)
>
>  But i often need a counter inside of the loop, may it be to create row
>  colors or other stuff. What i end up with then is:
>
>  i = 0
>  for thing in @several_things
>   print thing + " No. " + i.to_s
>   i += 1
>  end
>
>  Pardon me, but this is ugly, compared to the first clean lines. So far i
>  know ruby as an elegant language, so i wouldn't be surpised if there'd
>  be any kind of implemented counter in the for loop or a smarter way to
>  implement it.

Simple. Use #each_with_index instead of for... in:

@several_things.each_with_index do |thing, index|
  ....
end

Read up on Enumerable. It's pretty handy:
http://www.ruby-doc.org/core/classes/Enumerable.html


Christopher