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Monadic units with function overloading.
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| func unit <A> (x: A) -> A? { | |
| return Optional.Some(x) | |
| } | |
| func unit <A> (x: A) -> [A] { | |
| return [x] | |
| } | |
| // hypothetical examples | |
| func unit <A> (x: A) -> Tree<A> { | |
| return Tree<A>(root: x) | |
| } | |
| func unit <A> (x: A) -> Future<A> { | |
| return Future<A>(value: x) | |
| } |
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