Private class

The javascript default field is public (public), if you need to indicate private, you can use (#)

class Dog {
  #name;
  constructor(name) {
    this.#name = name;
  }
  printName() {
    // Only private fields can be called inside the class
    console.log(`Your name is ${this.#name}`)
  }
}
const dog = new Dog("putty")
//console.log(this.#name)
//Private identifiers are not allowed outside class bodies.
dog.printName()

#Static private class

class ClassWithPrivate {
  static #privateStaticField;
static #privateStaticFieldWithInitializer = 42;
  static #privateStaticMethod() {
    // …
  }
}