Yield* in dart

最新推荐文章于 2024-09-23 16:01:54 发布

原创最新推荐文章于 2024-09-23 16:01:54 发布 · 1.8k 阅读

0 ·

CC 4.0 BY-SA版权

Dart 专栏收录该内容

5 篇文章

订阅专栏

本文探讨了Dart语言中的异步编程技巧，重点讲解了使用yield*将一个子序列插入到当前序列的方法，并通过一个计数倒序输出的例子展示了其具体应用。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

import 'dart:async';

main(List<String> args) async {
  await for (int i in numbersDownFrom(10)) {
    print('$i apples');
  }
}

Stream numbersDownFrom(int n) async* {
  if (n >= 0) {
    await new Future.delayed(new Duration(milliseconds: 100));
    yield n;
    yield* numbersDownFrom(n - 1);
  }
}

The yield* (pronounced yield-each) statement. The expression following yield* must denote another (sub)sequence. What yield* does is to insert all the elements of the subsequence into the sequence currently being constructed, as if we had an individual yield for each element.

我的理解是将子序列插入到当前序列中