new this(...args)什么意思啊？

Question

下面代码什么意思啊

class  A{
  static instance(...args) {
        this.i = this.i || new this(...args)
        return this.i
    }
}

this.i = this.i || new this(...args)完全看不懂啊，这里this.i是个什么鬼
new this(...args)又是什么？

Answer 1

短路。等同於：

class A{
  static instance(...args) {
        if (this.i) this.i = this.i;
        else this.i = new this(...args);

        return this.i;
    }
}

new this(...args) is equal to new A(...args).

Answer 2

这里的new this(...args)什么意思？建立对象？