From: Michael Neumann <mneumann@...>
Date: 2004-08-03T04:45:10+09:00
Subject: Re: Request for two methods in Array class

Mike Hall wrote:
> Two small requests:
> 
> 1. A new method, Array.combine  (needs a better name for general use).
>    It takes entries from two (or many) arrays and combines them.
>    (like a combination of Array.zip, fetch, and map)
> 
>    For my use, I needed multiplication, but a block would be more general.
> 
>         a = [1,2,3]
>         b = [1,3,5]
>         a.combine(b)    => [1,6,15]
> 
>    Or with a block:
> 
>         a.combine(b) {|x,y| x*y}
>   
>    The new method would replace this sequence:
> 
>       a.zip(b).map {|e| e[0]*e[1]}

It's the same length:

  a.zip(b).map {|x,y| x*y}
  # vs.
  a.combine(b) {|x,y| x*y}

But I must say, that I like the name combine a lot.

Regards,

   Michael