Alexandre Langlais alexandrelanglais
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| trait M[T] { | |
| def flatMap[U](f: T => M[U]): M[U] | |
| def unit[T](x: T): M[T] | |
| } | |
| val l = List(1) | |
| l.map(x => x * 2) | |
| l.flatMap(x => List(x * 2)) | |
| // left unit |