From: Farrel Lifson <farrel.lifson@...>
Date: 2008-06-24T06:12:01+09:00
Subject: Suggestion: Enumerable#all?/any? with argument

I was thinking about Enumerable (one of Ruby's more powerful modules)
and I was wondering whether the following proposal to extend
Enumerable#all?/any? would have any merit. In a nutshell I think  any?
and all?  should take one argument which is then applied to each item
using the === operator. For example:
 [ "one", 2, "three"].all?( String )
would return false, while
 [ 1, 100, 1000].any?( 50...150 )
would return true.

In the case where both an argument and a block is supplied both the
block and the argument would be applied to the item and the results of
each operation would be combined with AND. For example:
 ["one", "two", "six"].all? ( String ) { |item| item.length == 3 }
would return true while
  [ 1, 2, "3" ].any? ( String ) { |item| item.to_i > 4 }
would return false.

Anyone else see any merit in this? The expression
  [ "one", "two", "three" ].all? String
just seems quite nice to me.

Farrel