can I add non static method to external class using prototypes?

Question

Can I add using prototypes function for a class instance?

so I'll be able to use this or __proto__ keyword inside my method, for example:

class PersonClass {
  name: string;

  constructor(name: string) {
    this.name = name;
  }

  sayHello() {
    console.log(`hello, my name is ${this.name} and I'm a ${this.type}`);
  }
}

PersonClass.prototype.type = "human";
PersonClass.prototype.PrintType = () => {
  console.log(`I'm a ${PersonClass.prototype.type}`);
};

const aria = new PersonClass("Ned Stark");
aria.sayHello();
aria.PrintType();

this code works of course, but I wish to add something like

PersonClass.prototype.SayHello2 = () => {
  console.log(this.name, caller.__proto__.name);
};

which of course fails.

is it even possible?

How exactly does it fail? Aren't classes compiled into "other primitives" (functions/objects) ? So if you can find that "other primitive" in the compiled code, surely you will be able to slap something onto the prototype. It's not "protected" afaik. Seems you can't with ES6: stackoverflow.com/questions/37680766/… . How about extending the class like a normal person :p ? — Ярослав Рахматуллин
– Ярослав Рахматуллин, Commented Oct 31, 2021 at 17:43
Does this answer your question? How to change Class's Prototype in ES6 — Ярослав Рахматуллин
– Ярослав Рахматуллин, Commented Oct 31, 2021 at 17:46
@ЯрославРахматуллин no this is not solving my issue. actually someone just did answer the right answer, which is disappeared now — Or Yaacov
– Or Yaacov, Commented Oct 31, 2021 at 17:56
Sorry, that was me. I answered it right away but then I deleted it when I saw the words "external class" and wanted to ask you for clarification. I have undeleted it, hope it helps. — Ray Toal
– Ray Toal, Commented Oct 31, 2021 at 18:17

Ray Toal · Accepted Answer · 2021-10-31 17:49:55Z

1

Your SayHello2 should be a non-arrow function to access the properties you are looking for:

PersonClass.prototype.SayHello2 = function () {
  console.log(this.name, this.type);
};

which produces:

"Ned Stark",  "human"

Don't forget you also have access to the constructor property of an instance as well, allowing you to access everything associate with your classes.

answered Oct 31, 2021 at 17:49

Ray Toal

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Or Yaacov · Accepted Answer · 2021-10-31 18:10:58Z

1

This should works:

    PersonClass.prototype.SayHello2 = function() {
      console.log(this.name);
    };

    aria.SayHello2(); // "Ned Stark"

edited Oct 31, 2021 at 18:10

Or Yaacov

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answered Oct 31, 2021 at 18:07

Shalom Peles

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