From: timsuth@... (Tim Sutherland)
Date: 2002-11-15T11:42:04+09:00
Subject: Re: ruby-dev summary 18613-18710

In article <20021112020739J.maki@rubycolor.org>, TAKAHASHI Masayoshi wrote:
[...]
>  There is a discussion whether Enumerable#zip is appropriate or not.
>
>   ex.
>    * Enumerable.zip(a, b, c...)
>    * Array.zip(a, b, c...)
>    * [a, b, c..].zip

How about the latter, with an optional block.

a = [1, 0, 3]
b = [2, 1, 2]
c = [3, 2, 1]

[a, b, c].zip { |x, y, z| x*y + z } #=> [5, 2, 7]

Now zip is like lisp's map.

One possibility for when the arrays are different lengths:
	1) No block is given: exception.
	2) A block is given: some block arguments will be nil in the
	usual way, up to the user to deal with it.

[...]