lazyman的实现

原创于 2023-02-06 23:25:21 发布 · 108 阅读

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#javascript #lazyman

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文章介绍了一个名为LazyMan的类，该类使用JavaScript实现，用于管理异步操作的顺序。它包含sayName、sleep、eat方法以及holdOn内部方法来模拟延迟执行。通过创建实例并链式调用方法，可以定义执行顺序，如先睡眠再吃饭等操作。

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class _LazyMan {
  queue: any[] = [];
  constructor(name: string) {
    this.sayName(name);

    setTimeout(() => {
      this.next();
    })
  }

  next() {
    const fn = this.queue.shift();
    fn && fn();
  }

  _holdOn(time) {
    return () => {
      setTimeout(() => {
        console.log(`Wake up after ${time} second`)
        this.next()
      }, time * 1000)
    }
  }

  sayName(name) {
    const fn = () => {
      console.log(`Hi! This is ${name}!`);
      this.next();
    }
    this.queue.push(fn);
  }

  sleep(time: number) {
    this.queue.push(this._holdOn(time));
    return this;
  }

  eat(some: string) {
    const fn = () => {
      console.log(`Eat ${some}~`);
      this.next();
    }
    this.queue.push(fn);
    return this;
  }

  sleepFirst(time: number) {
    this.queue.unshift(this._holdOn(time));
    return this;
  }
}

const LazyMan = (name: string) => new _LazyMan(name);

LazyMan('Hank').sleepFirst(2).eat('dinner').sleep(3).eat('supper');