javascript - Nodejs中当前类的实例

Question

我想测试一个变量是否是当前类的实例。所以我正在类的方法中检查。我希望有一种比指定类名更抽象的方法。在 PHP 中，可以使用 self 关键字。

在 PHP 中，它是这样完成的:

if ($obj instanceof self) {

}

nodejs 中的等价物是什么？

Answer 1

考虑您的评论(强调我的评论):

I want to test if a variable is an instance of the current class. So I'm checking within a method of the class. And I was hoping there's a more abstract way of doing than specifying the class name. In PHP it's possible with the self keyword.

我想说，在这种情况下，self 会映射到 this.constructor。考虑以下因素:

class Foo {}
class Bar {}
class Fizz {
  // Member function that checks if other 
  // is an instance of the Fizz class without 
  // referring to the actual classname "Fizz"
  some(other) {
    return other instanceof this.constructor;
  }
}

const a = new Foo();
const b = new Foo();
const c = new Bar();
const d = new Fizz();
const e = new Fizz();

console.log(a instanceof b.constructor); // true
console.log(a instanceof c.constructor); // false
console.log(d.some(a)); // false
console.log(d.some(e)); // true