laglangyue commented on code in PR #989:
URL: https://github.com/apache/incubator-pekko/pull/989#discussion_r1460483475
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stream/src/main/scala/org/apache/pekko/stream/scaladsl/Flow.scala:
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@@ -1792,6 +1792,30 @@ trait FlowOps[+Out, +Mat] {
*/
def foldAsync[T](zero: T)(f: (T, Out) => Future[T]): Repr[T] = via(new
FoldAsync(zero, f))
+ /**
+ * implemented by `Fold`, only emits its result when the upstream completes,
+ * after which it also completes. Applies the given function towards
initialized `true`
+ * and next predicate result, yielding the next predicate result.
+ *
+ * If the function `predicate` throws an exception and the supervision
decision is
+ * [[pekko.stream.Supervision.Restart]] current value starts at `true` again
+ * the stream will continue.
+ *
+ * Adheres to the [[ActorAttributes.SupervisionStrategy]] attribute.
+ *
+ * '''Emits when''' upstream completes
+ *
+ * '''Backpressures when''' downstream backpressures
+ *
+ * '''Completes when''' upstream completes
+ *
+ * '''Cancels when''' downstream cancels
+ *
+ * See also [[FlowOps.fold]]
+ */
+ def forall(predicate: Out => Boolean): Repr[Boolean] =
+ via(Fold(true, (acc: Boolean, element) => acc && predicate(element)))
Review Comment:
empty stream shoud true or false?
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