Method: Array#product

Defined in:
lib/core/facets/array/product.rb

#product(*enums) ⇒ Object

Provides the cartesian product of two or more arrays.

a = [1,2].product([4,5])
a  #=> [[1, 4],[1, 5],[2, 4],[2, 5]]

CREDIT: Thomas Hafner



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# File 'lib/core/facets/array/product.rb', line 12

def product(*enums)
  enums.unshift self
  result = [[]]
  while [] != enums
    t, result = result, []
    b, *enums = enums
    t.each do |a|
      b.each do |n|
        result << a + [n]
      end
    end
  end
  result
end