From: Florian Gross <flgr@...>
Date: 2005-03-18T01:34:49+09:00
Subject: Re: Array#nitems and Object#nil?

Yukihiro Matsumoto wrote:

> |On another note: Can we perhaps introduce Enumerable#count which returns 
> |the number of elements for which the block is true? I know that we can 
> |do .find_all { ... }.size, but constructing an Array of all elements 
> |just to get its size seems wasteful.
> 
>  enum.inject(0){|i,j| j ? i + 1 : i }
> 
> No array construction, bit harder to read than #count.

Is it too rare to deserve a built-in short cut?