doc: filter and filterNot streams operator, #25468

akka-docs/src/test/scala/docs/stream/operators/sourceorflow/Filter.scala

@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2019 Lightbend Inc. <https://www.lightbend.com>
+ */
+
+package docs.stream.operators.sourceorflow
+
+import akka.NotUsed
+import akka.actor.ActorSystem
+import akka.stream.scaladsl.Source
+
+object Filter {
+
+  implicit val system: ActorSystem = ActorSystem()
+
+  def filterExample(): Unit = {
+    // #filter
+    val words: Source[String, NotUsed] =
+      Source(
+        ("Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt " +
+        "ut labore et dolore magna aliqua.").split(" ").toList)
+
+    val longWords: Source[String, NotUsed] = words.filter(_.length > 6)
+
+    longWords.runForeach(println)
+    // consectetur
+    // adipiscing
+    // eiusmod
+    // tempor
+    // incididunt
+    // #filter
+  }
+
+  def filterNotExample(): Unit = {
+    // #filterNot
+    val words: Source[String, NotUsed] =
+      Source(
+        ("Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt " +
+        "ut labore et dolore magna aliqua.").split(" ").toList)
+
+    val longWords: Source[String, NotUsed] = words.filterNot(_.length <= 5)
+
+    longWords.runForeach(println)
+    // consectetur
+    // adipiscing
+    // eiusmod
+    // tempor
+    // incididunt
+    // #filterNot
+  }
+}