From: "Iñaki Baz Castillo" <ibc@...>
Date: 2009-12-11T07:51:58+09:00
Subject: Any Array method to delete elements and return them?

Hi, I've an array like this:

  a = [1,2,3,"aaa","bbb",4,"ccc"]

I want to remove from the array all the Strings, but also want these Strings 
in a new Array.

Array#delete_if of Array#reject! is not valid because they delete elements but 
don't return them, but the modified array:

  a.reject! {|e| e.is_a?(String)}
  => [1, 2, 3, 4]

  a.delete_if {|e| e.is_a?(String)}
  => [1, 2, 3, 4]

I want a method that deletes elements from the array and return the deleted 
elements, somethis as:

  a.delete_and_extract_if {|e| e.is_a?(String)}
  => ["aaa", "bbb", "ccc"]


Does such method exist?

PS: Of course I can do it by using Array#collet and Array#reject! in two 
different commands, but would like it to be more efficient.

Thanks.


-- 
Iñaki Baz Castillo <ibc@aliax.net>