Is there a way to override assignmenet operator in JS ES6 classes?

Asked Sep 18 '17 at 20:26

Active Sep 18 '17 at 20:26

Viewed 37 times

I have a class:

    export default class MyClass {
  constructor(data) {
    this.Value = data;
  }
  @observable Value;
}

I want to be able to do the following

this.myClass = new MyClass();
this.myClass = someData;

I want to be able to override an assignement operator in MyClass so I can do what I need to do with the someData that is passed into to.

asked Sep 18 '17 at 20:26

Pacman

Have you looked at [proxies](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy)? – Aadit M Shah Sep 18 '17 at 20:29
Elaborate, please? :) – faerin Sep 18 '17 at 20:30
You cannot overload the assignment operator. You could make `.myClass` a setter, but you cannot define this in `MyClass` – Bergi Sep 18 '17 at 20:30
If you familiar with C# or C++, there is a way to override certain parameters, I want to be able to do the same – Pacman Sep 18 '17 at 20:31
@Bergi I'm pretty sure that you can override assignments for object properties [using proxies](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/set). – Aadit M Shah Sep 18 '17 at 20:32
@AaditMShah can you show an example ? – Pacman Sep 18 '17 at 20:34
@AaditMShah You can define assignment behaviour for your instance's properties, but you cannot define what happens when your instance is *being* assigned. – Bergi Sep 18 '17 at 20:37
@Pacman JavaScript is not C++ or C#. – Bergi Sep 18 '17 at 20:38
@Bergi, gee what an epiphany I just had, thanks to your comment (eye rolls) – Pacman Sep 18 '17 at 20:40
`this.myClass` you can make myClass a property with a getter / setter. – Keith Sep 18 '17 at 20:52

0 Answers0