From: Intransition <transfire@...>
Date: 2010-09-27T23:22:06+09:00
Subject: Re: Get Proc of current block?

On Aug 27, 1:27 am, Michael Fellinger <m.fellin...@gmail.com> wrote:

> That's called the Y-combinator, something i wish could be added to
> core, but would be afraid of the many nay-sayers who are already
> confused by the current number of ways of creating blocks :)
>
> def y(*args, &block)
>   y = lambda{|*args| block.(*args, &y) }
> end
>
> p y{|n, acc, &b|
>   n < 2 ? acc : b.(n-1, n * acc)
>
> }.(5, 1)

Helpful. Thanks. I am considering adding to Facets, but it would have
to be called #Y b/c YAML defines #y.