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crossjoin.rb

This Ruby code snippet demonstrates the use of the product method in combination with other methods to create a collection of all possible combinations of elements from three arrays. The product method takes multiple arrays as arguments and returns a new array that contains all possible combinations of elements from the input arrays.

The first line of code, a = ('a'..'c').to_a, creates an array containing the letters ‘a’, ‘b’, and ‘c’. The second line, b = 2.times.to_a, creates an array containing two elements, 0 and 1. The third line, c = [{}], creates an empty hash.

The final line of code, a.product(b, c), uses the product method to create a new array that contains all possible combinations of elements from a, b, and c. This will result in a new array with 6 elements, each consisting of a combination of an element from a, b, and c.

For example, if the input arrays are ['a', 'b', 'c'], [0, 1], and {}, then the output array would contain the following combinations:

[['a', 0, {}], ['a', 1, {}], ['b', 0, {}], ['b', 1, {}], ['c', 0, {}], ['c', 1, {}]]

Note that the output array will contain a combination of each element from a, b, and c, in all possible orders.

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 3.4.4.