多次迭代 [英] Multiple iterations

问题描述

有一个更容易，更清洁的方式来编写代码如下：

Is there a easier, cleaner way to write code like this:

(1..10).each do |i| 
  (1..10).each do |j|
    (1..10).each do |k|
      (1..10).each do |l|
         puts "#{i} #{j} #{k} #{l}"
      end
    end
  end
end

理想情况下我可以做类似...

Ideally I'd be able to do something like...

(1..10).magic(4) { |i, j, k, l| puts "#{i} #{j} #{k} #{l}" }

更好...

magic(10, 4) { |i, j, k, l| puts "#{i} #{j} #{k} #{l}" }

没有内置的东西，我该如何写一个像最后一个方法？

If there's not something built in, how would I write a method like the last one?

推荐答案

如果你是Ruby 1.9，您可以这样做：

If you're on Ruby 1.9, you can do this:

range = (1..10).to_a
range.repeated_permutation(4) do |set|
  puts set.join(" ")
end

range = (1..10).to_a
range.product(range, range, range).each do |set|
  puts set.join(" ")
end

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