From: Matthias Reitinger <reitinge@...>
Date: 2008-07-08T19:52:36+09:00
Subject: Re: Multiply elements in array

Axel Etzold wrote:
> arr = ["abc", ["def", "def", "def"]]
> arr_final=[]
> arr[1].collect{|x|  arr_final<<[arr[0],x]}
> p arr_final

You could also shorten the processing step a bit:

  arr_final = arr[1].collect { |x| [arr[0], x] }

A little bit closer to what Chris had in mind would be:

  arr[0] = [arr[0]] * arr[1].size
  arr_final = arr.transpose

Alternatively and without changing the original array:

  arr_final = ([arr[0]] * arr[1].size).zip(arr[1])

Yet another way to do this is available in Ruby 1.8.7/1.9 (I think):

  arr_final = [[arr[0]].product(arr[1])


HTH, Matthias.
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