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Update GroupBy doc: use idiomatic groupBy key function #2795

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He-Pin merged 1 commit into from
Mar 28, 2026
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Update GroupBy doc: use idiomatic groupBy key function #2795

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7 changes: 4 additions & 3 deletions docs/src/test/scala/docs/stream/operators/sourceorflow/GroupBy.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -22,12 +22,13 @@ object GroupBy {
implicit val system: ActorSystem = ???
// #groupBy
Source(1 to 10)
.groupBy(maxSubstreams = 2, _ % 2 == 0) // create two sub-streams with odd and even numbers
.groupBy(maxSubstreams = 2, _ % 2) // create two sub-streams with odd and even numbers
.reduce(_ + _) // for each sub-stream, sum its elements
.mergeSubstreams // merge back into a stream
.runForeach(println)
// 25
// 30
// 30 (even: 2+4+6+8+10)
// 25 (odd: 1+3+5+7+9)
// Note: output order may vary since mergeSubstreams is non-deterministic
// #groupBy
}

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