ES6 Classes

class Person {
  constructor(firstname, lastname, birthYear) {
    this.firstname = firstname;
    this.lastname = lastname;
    this.birthYear = birthYear;
  }

  calcAge() {
    const currentYear = new Date().getFullYear();
    console.log(currentYear - this.birthYear);
  }
}

const jessica = new Person('Jessica', 'Doe', 1990);

class Person {
  constructor(fullName, birthYear) {
    this.fullName = fullName;
    this.birthYear = birthYear;
  }

  calcAge() {
    const currentYear = new Date().getFullYear();
    console.log(currentYear - this.birthYear);
  }

  get age() {
    return new Date().getFullYear() - this.birthYear;
  }

  // Set a property that already exists
  get fullName() {
    return this._fullName;
  }

  set fullName(name) {
    if (name.includes(' ')) this._fullName = name;
    else console.log('Please provide a full name with a first and last name.');
  }
}

const jessica = new Person('Jessica Davies', 'Doe', 1990);
jessica.fullName = 'Kevin Teaser';

class Person {
  ...
  
  static hey() {
    console.log('Hey there 👋');
  }

  ...
}

Person.hey();

class Student extends Person {
  constructor(fullName, birthYear, course) {
    super(fullName, birthYear);
    this.course = course;
  }

  introduce() {
    console.log(`My name is ${this.fullName} and I study ${this.course}`);
  }
}

const martha = new Student('Martha Jones', 2012, 'Computer Science');
martha.introduce();
martha.calcAge();

class Account {
  locale = navigator.language;
  bank = 'Bankist';
  #movements = [];
  #pin;

  constructor(owner, currency, pin) {
    this.owner = owner;
    this.currency = currency;
    this.#pin = pin;
  }

  get movements() {
    return this.#movements;
  }

  deposit(val) {
    this.#movements.push(val);
  }

  withdraw(val) {
    this.deposit(-val);
  }

  #approveLoan(val) {
    return true;
  }

  requestLoan(val) {
    if (this.#approveLoan(val)) {
      this.deposit(val);
      console.log('Loan approved');
    }
  }
}