From: "Jan E." <lists@...>
Date: 2012-12-08T16:17:24+09:00
Subject: Re: if n belongs to set a and m belongs to set b repeat some steps, How?

Hi,

so you want to iterate parallely over two arrays?

There are many ways to do that in Ruby. The most comfortable solution is
probably using Array#zip:

as, bs =
  [2, 4, 6], [10, 20, 30, 40]
as.zip bs do |a, b|
  puts "a: #{a}, b: #{b}"
end

You can also use Enumerators:

each_a, each_b =
  as.each, bs.each
loop do
  a, b =
    each_a.next, each_b.next
  puts "a: #{a}, b: #{b}"
end

And a low level Java-like solution would be

0.upto [as.length, bs.length].min - 1 do |i|
  puts "a: #{as[i]}, b: #{bs[i]}"
end

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