From: "Mauricio Fernández" <batsman.geo@...>
Date: 2003-07-05T15:48:07+09:00
Subject: Re: Ruby Code Snippet: Array.count

On Sat, Jul 05, 2003 at 03:43:00PM +0900, Simon Strandgaard wrote:
> On Sat, 05 Jul 2003 14:20:35 +0900, Dave Thomas wrote:
> > 
> >    class Array
> >      def count
> >        inject(0) {|sum, e| yield(e) ? sum + 1 : sum }
> >      end
> >    end
>  
> 
> I have added your Array#count (using inject), here:
> 
> http://www.rubygarden.org/ruby?StandardClassExtensions/Array

The other version is faster IMHO, and in this case at least as readable:

class Array
  def count
    sum = 0
	each { |x| sum += 1 if yield x }
	sum
  end
end
	


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