From: Patrick Bennett <patrick.bennett@...>
Date: 2002-08-16T13:31:44+09:00
Subject: Re: Hello everyone!

procs can be used as standalone 'closures' and passed around/called as 
callable functions (via the returned proc object).
ie:

def testFunc( obj )
    obj.call
  end

bleah = proc { puts "something" }
testFunc( bleah)
----
something

They can substitute as blocks by passing the proc (with a preceeding &) 
as a method parameter to something expecting a block.  This turns the 
proc into a block for that method.
ie:
foo = proc { |val| puts val }
a = [1,2,3]
a.each( &foo )
-----
1
2
3

I'm missing a couple other variations, but you should get the idea.  You 
might want to dig into the Thomas/Hunt book a bit more.


Robert Warning wrote:

> I'm just learning ruby and so far everything has been great (using the 
> Thomas and Hunt book), but I don't quite understand how proc objects 
> (and its call method) relate to code blocks. If anyone could explain I 
> would greatly appriciate it.
>