1class Counter {
2  constructor() {
3    this.count = 0;
4  }
5
6  increment() {
7    this.count++;
8    return this;
9  }
10
11  reset() {
12    this.count = 0;
13    return this;
14  }
15}
16
17const counter = new Counter();
18counter.increment().increment().reset();
19console.log(counter.count);