From: Daniel Sheppard <daniels@...>
Date: 2006-05-26T08:51:38+09:00
Subject: Re: Array#delete_if! - a method to delete and return all array items for which the block evaluates to true.

> Thanks. I didn't know about #partition.
> 
> Still, if anyone can suggest an improved pure-ruby solution, I'd be
> interested for educational reasons.


class Array
  def delete_if!
    to_delete = []
    delete_if do |item|
      to_delete << item if yield item
    end
    to_delete
  end
end 

irb(main):010:0> arr = [1,2,3,4,5,6]
=> [1, 2, 3, 4, 5, 6]
irb(main):011:0> arr.delete_if! {|x| x > 3}
=> [4, 5, 6]
irb(main):012:0> arr
=> [1, 2, 3]