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Remove ZSink.Step in favor of abstract methods on Sink and update ZSink encoding #1560

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Merged
merged 1 commit into from
Sep 13, 2019
Merged

Remove ZSink.Step in favor of abstract methods on Sink and update ZSink encoding #1560

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11 changes: 5 additions & 6 deletions docs/datatypes/sink.md
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Original file line number Diff line number Diff line change
Expand Up @@ -72,11 +72,11 @@ Basic fold accumulation of received elements:
Sink.foldLeft[Int, Int](0)(_ + _)
```

Fold where each fold step has to be described in sink `Step` API.
A `foldLeft` uses `Step.more` in its implementation:
A fold with control over continuation and the remainder produced by the sink.
`foldLeft` is implemented as a fold that always continues and produces no remainder.

```scala mdoc:silent
Sink.fold[Nothing, Int, Int](0)((acc, e) => ZSink.Step.more(acc + e))
Sink.fold[Nothing, Int, Int](0)(_ => true)((acc, n) => (acc + n, Chunk.empty))
```

Mapping over the received input elements:
Expand All @@ -90,7 +90,7 @@ Sink.fromFunction[Int, Int](_ * 2).collectAll
```scala mdoc:silent
Sink
.pull1[String, Int, Int, Int](IO.fail("Empty stream, no value to pull"))(init => Sink
.fold(init)((acc, e) => ZSink.Step.more(acc + e)))
.foldLeft[Int, Int](init)(_ + _))
```

`read1` tries to read head element from stream,
Expand All @@ -117,8 +117,7 @@ Sink.collectAll[Int].filter[Int](_ > 100)
Running two sinks in parallel and returning the one that completed earlier:

```scala mdoc:silent
Sink.fold[Int, Int, Int](0)((acc, e) => ZSink.Step.more(acc + e))
.race(Sink.identity[Int])
Sink.foldLeft[Int, Int](0)(_ + _).race(Sink.identity[Int])
```

For transforming given input into some sink we can use `contramap` which
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19 changes: 0 additions & 19 deletions streams-tests/jvm/src/test/scala/zio/stream/ArbitraryStep.scala
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