From: Phrogz <gavin@...>
Date: 2007-02-28T03:15:11+09:00
Subject: Re: Comparing two arrays

On Feb 27, 10:41 am, "Rafael George" <george.raf...@gmail.com> wrote:
> Hi, im trying to compare two arrays and creating a new one with the
> values that are in the second array and the values that aren't
> concatenated with "NOT FOUND", here is the snippet code.

Ruby makes it quite easy to find out which elements from one array
aren't in the other:

irb(main):001:0> a = [  'a', 'b', 'c', 'd' ]
=> ["a", "b", "c", "d"]
irb(main):002:0> b = [ 'c', 'b', 'd', 'e' ]
=> ["c", "b", "d", "e"]
irb(main):003:0> a - b    # Items from a not in b.
=> ["a"]
irb(main):004:0> b - a    # Items from b not in a.
=> ["e"]
irb(main):006:0> a | b    # Items shared between both.
=> ["a", "b", "c", "d", "e"]