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Cartesian product of arrays
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| // 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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