Created
December 24, 2019 22:43
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Stream yield async
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| import 'dart:async'; | |
| void main() async { | |
| Future<int> computeCost(int val) async { | |
| await Future.delayed(Duration(seconds: 1)); | |
| return val * 2; | |
| } | |
| Stream<int> generateValues1() { | |
| return Stream.periodic(Duration(seconds: 1), (val) { | |
| return val; | |
| }); | |
| } | |
| Stream<int> generateValues2() { | |
| return Stream.periodic(Duration(seconds: 1), (val) { | |
| return computeCost(val); | |
| }).map((futureRes) { | |
| futureRes.then((val) => print("Test: $val")); | |
| }); | |
| } | |
| Stream<int> generateValues3() async* { | |
| int i = 0; | |
| while (true) { | |
| await Future.delayed(Duration(seconds: 1)); | |
| yield i++; | |
| } | |
| } | |
| Stream<int> generateValues4() async* { | |
| int i = 0; | |
| while (true) { | |
| await Future.delayed(Duration(seconds: 2)); | |
| final cost = await computeCost(i++); | |
| yield cost; | |
| } | |
| } | |
| Stream<int> generateValues5() async* { | |
| yield* generateValues3(); | |
| } | |
| final subscription=generateValues5().listen((val) => print(val)); | |
| await Future.delayed(Duration(seconds: 10)); | |
| print("Cancelling subscription"); | |
| subscription.cancel(); | |
| } |
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