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crossjoin.rb

This Ruby code snippet demonstrates the use of product method to generate the Cartesian product of arrays.

• a is an array containing strings “a”, “b”, and “c”.
• b is an array containing integers 0 and 1.
• c is an array containing a single empty hash.
• a.product(b, c) calculates all possible combinations by taking one element from each array, resulting in an array of arrays where each inner array represents a combination. The result is a 2D array with 6 combinations.

Ruby code snippet

a = ('a'..'c').to_a
#=> ["a", "b", "c"]
b = 2.times.to_a
#=> [0, 1]
c = [{}]
#=> [{}]

a.product(b, c)
#=> 
[["a", 0, {}],
 ["a", 1, {}],
 ["b", 0, {}],
 ["b", 1, {}],
 ["c", 0, {}],
 ["c", 1, {}]]

Executed with Ruby 3.4.5.