From: Stefano Crocco <stefano.crocco@...>
Date: 2009-03-26T02:04:02+09:00
Subject: Re: delete from array while iterating

Alle Wednesday 25 March 2009, Tarscher ha scritto:
> Hi all,
>
> I want to delete an element from an array when it matches a condition.
> But I first want to print something to the screen when a amùcth is
> found.
>
> I know a.delete_if but can I somehow add that print to the screen next
> to the condition? If not , is there an alternative way to delete from
> an array while iterating?
>
> thanks
> Stijn

In the block you can do anything you want. Just make sure you return a true 
value or a false value depending on whether the element should be removed or 
not. Here's an example:

a = [1,-1,-2,2,3]

a.delete_if do |i|
  if i < 0
    puts "#{i} will be deleted"
    true
  else false
  end
end

This will return [1,2,3] and give the following output:

-1 will be deleted
-2 will be deleted

I hope this helps

Stefano