How to work with private variables in ES6? [duplicate]

Answer 1

ES6 standard does not offer a new way for defining private variables.

It's a fact, that new ES6 class is simply syntactic sugar around regular prototype-based constructors.

get and set keywords are offering a way for simplified definition of ES5 custom getters and setters that were previously defined with a descriptor of Object.defineProperty()

The best you could do is to use those techniques with Symbols or WeakMaps

The example below features the use of a WeakMap for storing private properties.

// myModule.js
const first_name = new WeakMap();

class myClass {
     constructor (firstName) {
          first_name.set(this, firstName);
     }

     get name() {
          return first_name.get(this);
     }
}

export default myClass;

I'm referring to article, written by David Vujic What? Wait. Really? Oh no! (a post about ES6 classes and privacy) with the idea of using WeakMaps.