From: Matt Maycock <ummaycoc@...>
Date: 2004-08-07T01:04:12+09:00
Subject: Re: procs/blocks - blocks with procs, blocks with blocks?

> If I understand what you're trying to do, the latest (CVS) ruby allows
> blocks to take blocks.
> 
> irb(main):001:0> lammy = lambda{|&b| b.call}
> => #<Proc:0x402145f8@(irb):1>
> irb(main):002:0> lammy.call{10}
> => 10
> irb(main):003:0>

Neato!


> I don't know if it will change or not.  I'm somewhat impartial to it,
> though.  I always thought the rationale for Proc#[] was not for saving
> keystrokes, nor for kludging a #() operator, but rather to allow a
> compact representation of a procedurally generated collection.  E.g.,
> instead of explicitly using an array of the numbers [0, 2, 4, ...,
> something_big], you can just use lambda{|x| 2*x}.  These sorts of uses
> generally have no business taking blocks.
> 
> I could of course be wrong, though.

I could imagine some uses for it taking a block... like the block
being a test for whether to use the current attempted return value, or
try to generate another...