From: Robert Klemme <shortcutter@...>
Date: 2007-08-21T17:22:37+09:00
Subject: Re: Detecting duplicates in an array, anything in the standa

2007/8/21, Pe�a, Botp <botp@delmonte-phil.com>:
> From: Jimmy Kofler [mailto:koflerjim@mailinator.com]
> #     uniq.map {|v| (self - [v]).size < (self.size - 1) ? v : nil}.compact
>
> cool.
> could we simplify it like,
>
> irb(main):014:0> a
> => [1, 1, 2, 2, 2, 4, 3]
> irb(main):015:0> a.select{|e| (a-[e]).size < a.size - 1}.uniq
> => [1, 2]

Nice! But I'd think this is more efficient:

irb(main):001:0> a = [1, 1, 2, 2, 2, 4, 3]
=> [1, 1, 2, 2, 2, 4, 3]
irb(main):002:0> a.uniq.select{|e| (a-[e]).size < a.size - 1}
=> [1, 2]

Kind regards

robert