From: Yukihiro Matsumoto <matz@...>
Date: 2005-03-16T00:58:12+09:00
Subject: Re: Array#nitems and Object#nil?

Hi,

In message "Re: Array#nitems and Object#nil?"
    on Tue, 15 Mar 2005 22:58:07 +0900, Florian Gross <flgr@ccan.de> writes:

|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.

							matz.