From: Alder Green <alder.green@...>
Date: 2006-05-26T09:05:23+09:00
Subject: Re: Array#delete_if! - a method to delete and return all array items for which the block evaluates to true.

On 5/26/06, Daniel Sheppard <daniels@pronto.com.au> wrote:
> > 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]
>

Yup, good one. Thanks.

-- 
-Alder