How to iterate multiple enumerables in ruby?

Question

I know two arrays can be zipped and the result can be iterated with #each. But how do you do it with an unknown number of enumerables? Let's say

anand = %w(1-0 0.5-0.5 0.5-0.5 1.0)
carlsen = %w(0-1 0.5-0.5 0.5-0.5 1.0)
kramnik = %w(0.5-0.5 0.5-0.5 0.5-0.5 1.0)
players= [anand, carlsen, kramnik]
#something smart

players.each{|round|puts round} #first line should be  "1-0 0-1 0.5-0.5"

Why can't you use a while loop and a plain old index variable? — Hamish Grubijan
– Hamish Grubijan, Commented Apr 10, 2010 at 22:28
@HamishGrubijan: Because using while-loops is more error prone and more verbose than using plain old higher-order functions. — sepp2k
– sepp2k, Commented Apr 10, 2010 at 22:41

glenn mcdonald · Accepted Answer · 2010-04-10 22:59:19Z

9

players.transpose.map {|a| a.join(" ")}

answered Apr 10, 2010 at 22:59

glenn mcdonald

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sepp2k · Accepted Answer · 2010-04-10 22:32:26Z

4

anand.zip(carlsen, kramnik) do |round| puts round.join(" ") end

This will print:

1-0 0-1 0.5-0.5
0.5-0.5 0.5-0.5 0.5-0.5
0.5-0.5 0.5-0.5 0.5-0.5
1.0 1.0 1.0

answered Apr 10, 2010 at 22:32

sepp2k

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