From: Martin DeMello <martindemello@...>
Date: 2003-08-01T05:03:26+09:00
Subject: Re: Changing ==,>,<, etc

Mark Wilson <mwilson13@cox.net> wrote:
> 
> On Thursday, July 31, 2003, at 02:22 PM, Nathan Weston wrote:
> 
>> [snip]
>> And all was well. But then I hit a snag:
>> # 1 < any(1,2,3)
>> ERR: (eval):1:in `<': Disjunction can't be coerced into Fixnum
>>
>> [snip some very interesting questions I intend to think about.]
> 
> What you want can be done with the any? method for arrays.
> 
> [1, 2, 3].any? { |e| 1 < e }
> 
> There's also an all? method.

any? and all? are very receiver-centric - compare

a.any? {|i| b.all? {|j| i < j} }

with

any(a) < all(b)

The latter shows up the symmetry a lot more clearly - I've always hated
having to write nested loops to express something flat.

martin