From: Nathan <njmacinnes@...>
Date: 2008-03-10T08:21:47+09:00
Subject: Re: passing procs around in variables

Thanks, that's great.

On Mar 9, 11:02 pm, "Stefan Lang" <perfectly.normal.hac...@gmail.com>
wrote:
> 2008/3/9, Nathan <njmacin...@gmail.com>:
>
>
>
> > [...]
> >  Now, the Item class, which each menu item is an object of, doesn't
> >  work as expected... take a look here:http://pastie.caboo.se/163781.
> >  When I try to call myItem.execute!, it complains "no block given". If
> >  I call myItem.execute! { 2 + 1}, then it works, but that's not what I
> >  want...
> >  class Item
> >    attr_reader :text
>
> >    def initialize(description, &proc)
> >      @description = description
> >      @proc = proc
> >    end
>
> >    def execute!
> >      yield @proc
> >    end
> >  end
>
> Use yield when the block is _not_ stored in a variable.
> What your yield line does is this: Call the block given to
> execute! with @proc as argument.
>
> Once you have a proc object, you can call it, well, with
> the "call" method. Just change "yield @proc" to
> "@proc.call" and it should work.
>
> HTH,
>   Stefan