From: Mark Hubbart <discordantus@...>
Date: 2005-05-07T02:27:58+09:00
Subject: Re: Array#squeeze

On 5/6/05, Logan Capaldo <logancapaldo@gmail.com> wrote:
> On 5/6/05, Martin DeMello <martindemello@yahoo.com> wrote:
> > The recent mention of String#squeeze made me wonder if it would not be a
> > good idea to add a #squeeze method to Array (or possibly even to
> > Enumerable) as well. Certainly I've needed it at least as often as I've
> > needed #uniq
> >
> > martin
> >
> >
> 
> Well here's a possible implementation:
> 
> module Enumerable
>         def squeeze(*args)
>                 raise ArgumentError.new("Provide 0 or 1 arguments") if
> args.length > 1
>                 inject([]) do |a, b|
>                         if args.length == 0
>                                 if b == a.last
>                                         a
>                                 else
>                                         a << b
>                                 end
>                         else
>                                 if b == a.last && a.last == args[0]
>                                         a
>                                 else
>                                         a << b
>                                 end
>                         end
>                 end
>         end
> end

String's squeeze allows arbitrary numbers of character arguments. II
would think Enumerable#squeeze should do the same:

module Enumerable
  def squeeze(*args)
    ary = []
    check = proc{|item| args.empty?? true : args.include?(item) }
    each{|elem| ary << elem unless ary.last == elem and check[elem] }
    ary
  end
end

cheers,
Mark