Factory & Constructor Functions

What's the advantage of using class fields in this pattern?

class UserFactory {
  static #defaults = {
    role: 'user',
    permissions: ['read']
  };

  static createUser(data) {
    return {
      ...this.#defaults,
      ...data,
      createdAt: new Date()
    };
  }
}

It makes the code run faster
Private fields provide better encapsulation
Using private class fields (#defaults) provides true encapsulation of the default values, making them inaccessible from outside the factory. This prevents external code from modifying the defaults while still allowing the factory to use them when creating new users. This level of encapsulation wasn't possible with traditional constructor functions or older class syntax, making it a valuable feature for factory implementations.
Static fields improve memory usage
Class fields are more readable than functions

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