From: Martin DeMello <martindemello@...>
Date: 2005-04-14T13:59:37+09:00
Subject: Re: Weaving Arrays

galizur@gmail.com wrote:
> 
> Any suggestions on a quick way to weave two arrays?

This works as long as you pass it an array:

class Array
  def weave(other)
    zip(other * (length / other.length + 1)).flatten
  end
end

Not very efficient, since it creates two intermediate arrays, but this is
seldom a problem in practice.

Here's a more efficient way:

class Array
  def weave(other)
    l = other.length
    retval = []
    each_with_index {|e,i|
      if block_given?
        yield [e, other[i%l]]
      else
        retval << e
        retval << other[i%l]
      end	
    }
    return block_given? ? self : retval
  end
end
    
martin
~