[DART] Stream 클래스 : async*/yield 키워드 사용하기

■ Stream<T> 클래스에서 async*/yield 키워드를 사용하는 방법을 보여준다.

▶ 예제 코드 (DART)


import 'dart:async';

void main() async {
  Stream<String> stream = await getStream(['A', 'B', 'C', 'D', 'E']);

  int count = await Print(stream);

  print(count);
}

const Duration duration = Duration(seconds: 1);

Stream<String> getStream(Iterable<String> itemIterable) async* {
  for (String item in itemIterable) {
    await Future.delayed(duration);

    yield item;
  }
}

Future<int> Print(Stream<String> stream) async {
  int count = 0;

  await for (String item in stream) {
    print(item);

    count++;
  }

  return count;
}

import 'dart:async';

void main() async {

Stream<String> stream = await getStream(['A', 'B', 'C', 'D', 'E']);

int count = await Print(stream);

print(count);

}

const Duration duration = Duration(seconds: 1);

Stream<String> getStream(Iterable<String> itemIterable) async* {

for (String item in itemIterable) {

await Future.delayed(duration);

yield item;

}

Future<int> Print(Stream<String> stream) async {

int count = 0;

await for (String item in stream) {

print(item);

count++;

}

return count;

}