Classes and objects

main.js

class Person {
  constructor(firstName, lastName) {
    this.firstName = firstName;
    this.lastName = lastName;
  }
  
  get fullName() {
    return `${this.firstName} ${this.lastName}`;
  }
  
  introduce() {
    return `Hi, my name is ${this.fullName}.`;
  }
}

const david = new Person('David', 'Tang');
david.firstName;
david.introduce();

const david2 = {
  firstName: 'David',
  lastName: 'Tang',
  get fullName () {
    return `${this.firstName} ${this.lastName}`;
  },
  introduce() {
    return `Hi, my name is ${this.fullName}.`;
  }
};

david2.introduce();

class Student extends Person {
  study() {
    return `${this.fullName} has notifications turned off.`
  }
}

const joshua = new Student('Joshua', 'Yoo');
joshua.study();
joshua.introduce();