Private properties in JavaScript ES6 classes

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Is it possible to create private properties in ES6 classes?

Here’s an example. How can I prevent access to instance.property?

class Something {
  constructor(){
    this.property = "test";
  }
}

var instance = new Something();
console.log(instance.property); //=> "test"

Answer

Private fields (and methods) are being implemented in the ECMA standard. You can start using them today with babel 7 and stage 3 preset.

class Something {
  #property;

  constructor(){
    this.#property = "test";
  }

  #privateMethod() {
    return 'hello world';
  }

  getPrivateMessage() {
      return this.#property;
  }
}

const instance = new Something();
console.log(instance.property); //=> undefined
console.log(instance.privateMethod); //=> undefined
console.log(instance.getPrivateMessage()); //=> test


Source: stackoverflow