From: Eric Hodel <drbrain@...7.net>
Date: 2006-05-26T07:15:42+09:00
Subject: Re: Array#delete_if! - a method to delete and return all array items for which the block evaluates to true.

On May 25, 2006, at 3:03 PM, Alder Green wrote:

> Here's a method to delete and return all items in an Array for which
> the block evaluates to true:

[...]

> Would people suggest better implementations?  The obvious problem here
> is that we're duplicating arr (to_delete and to_keep contatin together
> a cloned arr). I came up with an index based solution to avoid that,
> but frankly it was quite ugly.

$ ri Array#reject!
---------------------------------------------------------- Array#reject!
      array.reject! {|item| block }  -> array or nil
------------------------------------------------------------------------
      Equivalent to +Array#delete_if+, deleting elements from _self_ for
      which the block evaluates to true, but returns +nil+ if no changes
      were made. Also see +Enumerable#reject+.

-- 
Eric Hodel - drbrain@segment7.net - http://blog.segment7.net
This implementation is HODEL-HASH-9600 compliant

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