From: Ian Macdonald <ian@...>
Date: 2003-07-05T08:38:00+09:00
Subject: Re: Ruby Code Snippet: Array.count

On Sat 05 Jul 2003 at 08:01:38 +0900, Stefan Arentz wrote:

> 
> Maybe this functionality is already somewhere in Ruby, but I could not
> find it. This little snippet extends Array with a count method. It takes
> a code block that can be used to count elements that match a specific
> condition:
> 
>  a = Array[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
>  puts a.count { |v| v < 5 }

This is already available with Enumerable#find_all:

a = (1..10).to_a
puts a.find_all {|v| v < 5 }.size

4

Ian
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