Basic examples of using Stream methods in Dart

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Basic Examples: Dart Stream methods

Basic examples of using Stream methods in Dart

Find this at dartpad.dartlang.org/70fd2ba01c1060d14240446211b53876.

main.dart

import "dart:async";

main() async {
  print(" * Starting *");
  Function elPrinter = (e) { print("Element $e");};

  List<int> numbers = new List<int>.generate(10, (i) => i); // 0 - 9
  Stream<int> numberStream = new Stream.fromIterable(numbers);
  numberStream.map((x) => x * 10) //0,10,20,30...
              .expand((x) => [x, x+1,x+2,x+3 ]) //0,1,2,3,10,11,12,13...
              .where( (x) => x.isEven) //0,2,10,12,20,22,30,32...
              .takeWhile( (x) =>  x < 70) // ...50,52,50,62
              .skip(2) // 10,12,20,22,30,32,40,42,50,52,60,62
              .listen(elPrinter);
  print(" * Ending * "); 
}