From: Daniel Schierbeck <daniel.schierbeck@...>
Date: 2006-04-20T03:41:14+09:00
Subject: Re: Symbol#to_proc is just so beautiful

Berger, Daniel wrote:
>>    [1, 2, 3].all? &:positive?  => true
>>    [-1, 2, 3].all? &:positive? => false
> There must be a way to ditch that '&' somehow.  I'd prefer this:
> [1,2,3].all?(:positive?)

The beauty of Symbol#to_proc is that you don't need to change any method 
definitions for it to work; any method that yields a single argument can 
take a symbol proc as a block, and it'll work out of the box.

   arr.any? &:positive?
   arr.none? &:positive?
   arr.each(&:upcase!)
   arr.collect(&:downcase)


Daniel