From: Vraj Mohan <vrajmohan@...>
Date: 2005-04-14T22:44:49+09:00
Subject: Re: Weaving Arrays

galizur@gmail.com wrote:
> Any suggestions on a quick way to weave two arrays?
> 
> To split up a file with fixed width columns, and to then insert
> a tab after each one, is fast and easy:
> 
> File.open($*[0]).each do |raw_line|
>   line = raw_line.chomp.unpack($format)
>   last = line.pop
>   $stdout << line*"\t" << last << "\n"
> end
> 
> But what if I wanted to do something more general, such as weaving
> two arrays?
> 
> This works:
> 
> File.open($*[0]).each do |raw_line|
>   line = raw_line.chomp.unpack($split)
>    line.each_index do |i|
>      $stdout << line[i] << format[i]
>    end
> end
> 
> There must be a speedier way.  Ideally, it'd be nice to be able to
> do something like line*format, with the product the weave of the two
> arrays.  If the second array is shorter, repeat from the beginning.
> This would be an extension of the way array*string currently works.
> --
> Chris Long, San Diego Padres, 100 Park Boulevard, San Diego CA 92101
> 
> Score: 0, Diff: 1, clong killed by a Harvard Math Team on  1
> 
> 
> 
Have you looked at Array#zip?