He-Pin commented on code in PR #990:
URL: https://github.com/apache/incubator-pekko/pull/990#discussion_r1460406664
##########
docs/src/main/paradox/stream/operators/Flow/exists.md:
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@@ -0,0 +1,37 @@
+# exists
+
+Emit true and complete the stream as soon as there's an element satisfy the
*predicate*, or emit false when upstream
+complete and no element satisfied the *predicate*.
+
+@ref[Simple operators](../index.md#simple-operators)
+
+## Signature
+
+@apidoc[Flow.exists](Flow$) { scala="#exists[I](p:Out%20=%3E%20Boolean)"
java="#exists[I](p:org.apache.pekko.japi.function.Predicate[I])" }
+
+## Description
+
+Emit true and complete the stream as soon as there's an element satisfy the
*predicate*, or emit false when upstream
+complete and no element satisfied the *predicate*.
Review Comment:
Emits completes
##########
docs/src/main/paradox/stream/operators/Flow/exists.md:
##########
@@ -0,0 +1,37 @@
+# exists
+
+Emit true and complete the stream as soon as there's an element satisfy the
*predicate*, or emit false when upstream
+complete and no element satisfied the *predicate*.
+
+@ref[Simple operators](../index.md#simple-operators)
+
+## Signature
+
+@apidoc[Flow.exists](Flow$) { scala="#exists[I](p:Out%20=%3E%20Boolean)"
java="#exists[I](p:org.apache.pekko.japi.function.Predicate[I])" }
+
+## Description
+
+Emit true and complete the stream as soon as there's an element satisfy the
*predicate*, or emit false when upstream
+complete and no element satisfied the *predicate*.
+
+## Examples
+
+Scala
+: @@snip
[Exists.scala](/docs/src/test/scala/docs/stream/operators/flow/DiMap.scala) {
#imports #exists }
+
+Java
+: @@snip
[Exists.java](/docs/src/test/java/jdocs/stream/operators/flow/DiMap.java) {
#imports #exists }
Review Comment:
Another file instead of Dimap.java？
##########
docs/src/main/paradox/stream/operators/Flow/exists.md:
##########
@@ -0,0 +1,37 @@
+# exists
+
+Emit true and complete the stream as soon as there's an element satisfy the
*predicate*, or emit false when upstream
+complete and no element satisfied the *predicate*.
+
+@ref[Simple operators](../index.md#simple-operators)
+
+## Signature
+
+@apidoc[Flow.exists](Flow$) { scala="#exists[I](p:Out%20=%3E%20Boolean)"
java="#exists[I](p:org.apache.pekko.japi.function.Predicate[I])" }
+
+## Description
+
+Emit true and complete the stream as soon as there's an element satisfy the
*predicate*, or emit false when upstream
+complete and no element satisfied the *predicate*.
+
+## Examples
+
+Scala
+: @@snip
[Exists.scala](/docs/src/test/scala/docs/stream/operators/flow/DiMap.scala) {
#imports #exists }
+
+Java
+: @@snip
[Exists.java](/docs/src/test/java/jdocs/stream/operators/flow/DiMap.java) {
#imports #exists }
+
+## Reactive Streams semantics
+
+@@@div { .callout }
+
+**emits** when predicate returned true or upstream completes
+
+**backpressures** '''Backpressures when'' downstream backpressures
+
+**completes** when predicate returned true or upstream completes
Review Comment:
Return false
##########
docs/src/main/paradox/stream/operators/Flow/exists.md:
##########
@@ -0,0 +1,37 @@
+# exists
+
+Emit true and complete the stream as soon as there's an element satisfy the
*predicate*, or emit false when upstream
Review Comment:
Emits ,complete.
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