From: kennethkunz@...
Date: 2005-04-15T05:59:35+09:00
Subject: Re: Weaving Arrays

Take a look at the SyncEnumerator class from the generator standard
library:
http://www.ruby-doc.org/stdlib/libdoc/generator/rdoc/index.html

This can be used to "weave" two objects of any enumerable class.  Not
quite what you're looking for... if the collections are of different
lengths, nil is weaved-in with the remaining elements from the longer
one.  It shouldn't be hard to extend the SyncEnumerator class to do
what you suggest, though.

Example:

  require 'generator'
  a = (1..5)
  b = ('a'..'c')
  c = SyncEnumerator.new(a,b)
  c.each { |row| puts row.join("\t") }

Output:

  1    a
  2    b
  3    c
  4
  5

Also:

  c.to_a => [[1, "a"], [2, "b"], [3, "c"], [4, nil], [5, nil]]

Cheers,
Ken