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crossjoin.rb

This Ruby code snippet demonstrates nested product method usage. It generates all possible combinations of elements from arrays a, b, and c. a contains characters ‘a’, ‘b’, and ‘c’, b contains integers 0 and 1, and c contains a single empty hash. The product method effectively creates a new array containing all possible tuples formed by taking one element from each of these arrays.

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.