Created
July 21, 2018 21:08
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scanState in fs2
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| def scanState[F[_], S, A, B](init: S)(f: A => State[S, B]): Pipe[F, A, B] = | |
| _.pull.scanSegments(init){ | |
| case (previousState, segment: Segment[A, Unit]) => | |
| segment.mapAccumulate(previousState)({ | |
| case (state, o1) => | |
| val stateFunc = f(o1) | |
| (stateFunc run state).value | |
| }).mapResult(_._2) | |
| }.stream |
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