From: David Alan Black <dblack@...>
Date: 2001-08-16T00:23:34+09:00
Subject: [ruby-talk:19790] Re: 2 iterator questions

Hello --

On Thu, 16 Aug 2001, Mark Slagell wrote:

> I'm looking at some code in the FAQ (section 5) illustrating the
> relationship between blocks and proc objects.  Two questions come to mind:
>
> -------------------------------------
> 1. "An iterator is a method which accepts a block or a Proc object."  How
> to accept a proc object?  I can't come up with working syntax.  This
> chokes, anyway:
>
>   pr = proc {|x| x+1}
>   [1,2,3].each pr
>
> Since the error indicates that pr is being treated as a paramater, I tried
> this
>
>   [1,2,3].each() pr
>
> and got a parse error.  On the other hand there's no problem sending a
> proc object through the regular argument list:
>
>   def iter(aproc)
>     aproc.call 17
>   end
>
>   iter pr   #->  18
>
> Is that what is meant by saying iterators can accept proc objects?

Try:

   [1,2,3].each &pr


David

-- 
David Alan Black
home: dblack@candle.superlink.net
work: blackdav@shu.edu
Web:  http://pirate.shu.edu/~blackdav