What are private fields in JavaScript ES6 classes?

What are private fields in JavaScript ES6 classes?

Private fields are a way to define properties in a class that cannot be accessed from outside the class. They are prefixed with a # symbol.

Can you give me an example of how to use private fields?

Sure! Here's a simple example:

class Person {
  #name;

  constructor(name) {
    this.#name = name;
  }

  getName() {
    return this.#name;
  }
}

const person = new Person('Alice');
console.log(person.getName()); // Alice
console.log(person.#name); // SyntaxError: Private field '#name' must be declared in an enclosing class

What happens if I try to access a private field directly?

If you try to access a private field directly from outside the class, you'll get a SyntaxError, as shown in the example.