From: Robert Klemme <bob.news@...>
Date: 2004-08-05T21:01:27+09:00
Subject: Re: Macros in Ruby


"Mauricio Fern�ndez" <batsman.geo@yahoo.com> schrieb im Newsbeitrag
news:20040805113529.GA14601@student.ei.uni-stuttgart.de...
> On Thu, Aug 05, 2004 at 07:16:29PM +0900, Robert Klemme wrote:
> > > - Argument passing, a block isn't strict about the arguments
> > >   it gets passed, (i.e. it can take any argument).  A Proc
> > >   object in contrast is strict (like methods).  The reason I
> > >   can think of is that it is often usefull not to get all arguments
> > >   in a block, i.e. 3.times{ puts "Hi, world!" }
> >
> > I don't know what exactly you mean by this.  Argument passing is the
same
> > for blocks and procs IMHO.  Can you explain the difference?
>
> >> def foo; yield 1,2 end;  foo { |a,b,c,d| }
> => nil
> >> lambda{|a,b,c,d|}.call 1, 2
> ArgumentError: wrong number of arguments (2 for 4)
>         from (irb):2
>         from (irb):2:in `call'
>         from (irb):2
> >> Proc.new{|a,b,c,d|}.call 1, 2
> => nil
> >> RUBY_VERSION
> => "1.8.2"
> >> RUBY_RELEASE_DATE
> => "2004-07-30"

Thanks!  Also:

irb(main):001:0> def foo(&b) b.call 1,2 end
=> nil
irb(main):002:0> foo {|a,b,c,d|}
=> nil

    robert