It’s done with basic operators instead of methods: - for difference, | for union, and & for intersection.
An important detail is that all duplicated items are automatically removed. Which allows to make an array unique finding the intersection between itself: [1, 1, 2] & [1, 1, 2] = [1, 2].
Difference
[1, 2, 3] - [3, 4, 5] = [1, 2]
[3, 4, 5] - [1, 2, 3] = [4, 5]
In summary, it returns the unique values only present in the first array.
Union
[1, 2, 1, 2, 3] | [1, 2, 3, 4] = [1, 2, 3, 4]
Intersection
[1, 1, 3, 5] & [1, 2, 3] = [1, 3]
Source: https://www.endpoint.com/blog/2011/06/07/using-set-operators-with-ruby-arrays
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