From: James Edward Gray II <james@...>
Date: 2007-03-01T10:35:43+09:00
Subject: Re: Functional programming in Ruby

On Feb 28, 2007, at 4:20 PM, Brian Candler wrote:

> puts proc { |n|
>   proc { |fact| fact.call(fact, n) }.call(
>     proc { |ft, k|
>       k <= 1 ? 1 : k * ft.call(ft, k-1)
>     }
>   )
> }.call(10)

> proc { |*a|
>   proc { |iter| iter.call(iter, *a) }.call(
>     proc { |me, n, f|
>       if n >= 1
>         f.call()
>         me.call(me, n-1, f)
>       end
>     }
>   )
> }.call(3, proc { puts "hello again" } )

Wow, those melted my brain.

I kept thinking I could peel off the outer layer off the factorial  
one, but I didn't succeed.  Wild stuff.

Thanks for sharing.

James Edward Gray II