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eneko/ArrayProduct.swift

Last active June 3, 2020 21:53
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Cartesian product of arrays
Raw
ArrayProduct.swift
// Cartesian product of two arrays
func * <U, V>(lhs: [U], rhs: [V]) -> [(U, V)] {
lhs.flatMap { left in
rhs.map { right in
(left, right)
}
}
}
print([1, 2, 3] * ["a", "b"])
// [(1, "a"), (1, "b"), (2, "a"), (2, "b"), (3, "a"), (3, "b")]
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