From: David Alan Black <dblack@...>
Date: 2002-01-01T02:48:38+09:00
Subject: [ruby-talk:29877] Re: Proc.class vs yield

Hi --

On Tue, 1 Jan 2002, Joel VanderWerf wrote:

> David Alan Black wrote:
>
> > Hmmm... I wonder whether part of what you're not liking is the fact
> > that the {} operator is overloaded: it's a block constructor and also
> > a hash constructor.  So there needs to be a way to deal with things
> > like:
> >
> >   some_method( { "hi" }, { "one" => 1 }, { |x| puts x })
>
> There is still some room to overload {} a bit more. The syntax
>
>   some_method {|x| x+1} {|y| y-1}
>
> has no meaning currently--it's a parse error. Could this syntax be given
> a meaning so that
>
>   def some_method(&b1, &b2)
>   end
>
> allowed the method to use both blocks?

What would yield do?

> I'm not sure I'd propose this for RCR, since I haven't seen a use for it
> that couldn't be handled some other way. But still it would be kinda
> nice. It would allow you to write control structures a la Tcl:

That would be a mighty big RC :-)

>   while {<test>} {
>     <do stuff>
>   }
>

I don't know Tcl.  What does that structure give you?


David

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