From: dblack@...
Date: 2002-11-19T09:06:05+09:00
Subject: Re: ruby-dev summary 18711-18810

Hi --

On Tue, 19 Nov 2002, Massimiliano Mirra wrote:

> On Tue, Nov 19, 2002 at 12:19:50AM +0900, dblack@candle.superlink.net wrote:
> > > |Do you mean that map_with_index has been rejected on its own, or just
> > > |as a zip implementation?
> > Hmmmm....  I'll try to think of some examples.  It certainly seems to
> > me to be at least as useful as each_with_index, potentially (i.e., if
> > it existed :-)
>
> I guess, if zip existed, you could simulate that with:
>
> a = ["a", "b", "c", "d"]
> a.zip(0...a.length).map {|item, index| ...}

And if map_with_index existed, you could define #zip in terms of it
:-)

  def zip(*others)
    map_with_index {|e,i| [e,others.map{|n| n[i]}]}
  end

(or something)


David

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