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Compute a massive array on an array of arrays

To compute Cartesian product in Ruby can be used Array#product

as syntax if I have an array of arrays and want to compute the product?

[[1,2],[3,4],[5,6]] => [[1,3,5], [2,3,5], ...]

I'm not sure, because the Ruby documentation product

defines a method with an arbitrary number of arguments, so just pass arrays of arrays as an argument, like this:

[].product(as) => [

lacks. How can I solve this?

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2 answers


The method accepts multiple arguments, but not an array containing the arguments. Therefore, you should use it this way:

[1,2].product [3,4], [5,6]


If as

is your array of arrays, you will have to "split" it like this:

as[0].product(*as[1..-1])
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Nearest notation:



:product.to_proc.call(*as)

# shorthand
:product.to_proc.(*as)
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