How to define a private methods in JavaScript Classes?

With the recent addition to JavaScript with ES2022, classes can now have private methods along with private fields which are accessible only through class object.
To define a private method we prefix the method name with # sign.
You can define private method for instance, static and getters/setters methods in a class.

// Syntax for defining a private method
class SamplePrivateMethod {
  #privateMethod() {
    // function definition to perform any action.
  }
}

• # Symbol is used to define private method.
• Private methods can be accessed inside a class only not from subclass (extended class).
• To access private method you can use this keyword as well as class name.

class Car {
  #speed;
  get #getCarSpeed() {
    return this.#speed;
  }
// using this keyword
  set #setCarSpeedUsingThisKeyword(value) {
    this.#speed = value;
  }
// using class name
  set #setCarSpeedUsingClassName (value) {
    Car.#speed = value;
  }
}

class StreetAddress {
  // private fields
  #lineOne;
  #lineTwo;

  // class fields are accessed using this keyword.
  constructor(lineOne, lineTwo) {
    this.#lineOne = lineOne;
    this.#lineTwo = lineTwo;
  }

  // defined function that can be accessed outside class.
  getFormattedAddress() {
    return this.#lineOne() + ' , ' + this.#lineTwo();
  }

  // private functions for processing of data accessible only inside class.
  #getLineOne() {
    return `${this.#lineOne}`;
  }
  #getLineTwo() {
    return `${this.#lineTwo}`;
  }
}

let formattedAddress = new StreetAddress('123 Sample Street', 'Sample City');

console.log(formattedAddress.getFormattedAddress());

// output : 123 Sample Street , Sample City

class StreetAddress {
  // private fields
  #lineOne;
  #lineTwo;

  // class fields can be accessed using both,
  // this keyword & class name.
  constructor(lineOne, lineTwo) {
    this.#lineOne = this.#validateAddress(lineOne);
    this.#lineTwo = StreetAddress .#validateAddress(lineTwo);
  }

  static #validateAddress(addressLine) {
    if (typeof addressLine === 'string') {
      let str = addressLine.trim();
      if (str.length >= 3) {
        return str;
      }
    }
    throw 'Address line cannot be left blank.';
  }

  // defined function that can be accessed outside class.
  getFormattedAddress() {
    return this.#lineOne() + ' , ' + this.#lineTwo();
  }

  // private functions for processing of data accessible only inside class.
  #getLineOne() {
    return `${this.#lineOne}`;
  }
  #getLineTwo() {
    return `${this.#lineTwo}`;
  }
}

let formattedAddress = new StreetAddress('123 Sample Street', 'Sample City');

console.log(formattedAddress.getFormattedAddress());

// output : 123 Sample Street , Sample City