From: WATANABE Hirofumi <eban@...>
Date: 2002-11-28T02:41:15+09:00
Subject: Re: Array#and? and Array#or? methods?

Jeff de Vries <jdevries@pfrog.com> writes:

> 
> Is there some reason the following methods on Array aren't included as 
> standard?
> 
> class Array
>   def and?
>     # return true if the provided block returns true for every element
>     each {|x| return false unless yield x} if block_given?
>     return true
>   end
>   def or?
>     # return true if the provided block returns true for at least one 
> element
>     each {|x| return true if yield x} if block_given?
>     return false
>   end
> end
> 
> I find these to be very useful, and was suprised to not see them.  Is 
> there another way to get the same effect (including short circuit of 
> evaluation as soon as a condition fails)?

Ruby 1.7 has Enumerable#all? and Enumerable#any? .

-- 
eban