zip

Combines elements from each of multiple sources into tuples Pair and passes the tuples pairs downstream.

Fan-in operators

Signature

Source.zipSource.zip Flow.zipFlow.zip

Description

Combines elements from each of multiple sources into tuples Pair and passes the tuples pairs downstream.

See also:

• zipAll
• zipWith
• zipWithIndex

Examples

Scala

copysourceimport akka.stream.scaladsl.Source
import akka.stream.scaladsl.Sink

    val sourceFruits = Source(List("apple", "orange", "banana"))
    val sourceFirstLetters = Source(List("A", "O", "B"))
    sourceFruits.zip(sourceFirstLetters).runWith(Sink.foreach(println))
    // this will print ('apple', 'A'), ('orange', 'O'), ('banana', 'B')

Java

copysourceimport akka.stream.javadsl.Keep;
import akka.stream.javadsl.Source;
import akka.stream.javadsl.Sink;

import java.util.*;

Source<String, NotUsed> sourceFruits = Source.from(Arrays.asList("apple", "orange", "banana"));
Source<String, NotUsed> sourceFirstLetters = Source.from(Arrays.asList("A", "O", "B"));
sourceFruits.zip(sourceFirstLetters).runForeach(System.out::println, system);
// this will print ('apple', 'A'), ('orange', 'O'), ('banana', 'B')

Reactive Streams semantics