Created
June 12, 2021 13:14
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Opaque Option type
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| opaque type Option[T] = T | Null | |
| object Option: | |
| def apply[T](t: T): Option[T] = t | |
| def None: Option[Nothing] = null | |
| extension [T](t: Option[T]) | |
| def map[U](fn: T => U): Option[U] = | |
| if t == null then None else fn(t.asInstanceOf[T]) | |
| def flatMap[U](fn: T => Option[U]): Option[U] = if t == null then None else fn(t.asInstanceOf[T]) |
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