Classes

How to create a class:

• Classes are templates for JavaScript objects.
• A constructor method is called when we create a new instance of a class.

class Employee {
  constructor(name, department) {
    this.name = name;
    this.department = department;
  }
}
const emp1 = new Employee('Tom', 'IT');
console.log(emp1.name);

output:

"Tom"

Inheritance:

• A child class can inherit the properties and methods from a parent class.
• The extends keyword is used when we create a subclass from the parent class.
• The super keyword calls the constructor() of a parent class.
• Static methods are always called on the class, but not on instances of the class.

class Employee {
  constructor(name) {
    this._name = name;
    this._totalVacationDays = 20;
  }
  get name() {
    return this._name;
  }
  get totalVacationDays() {
    return this._totalVacationDays;
  }
  static generateTempPassword(){
    return Math.floor(Math.random()*100000);
  }
}
class Accountant extends Employee {
  constructor(name, education) {
    super(name);
    this._education = education;
  } 
  get educationInfo() {
    return this._education;
  }
}
const accountant1 = new Accountant('Tom', 'Masters');
console.log(accountant1.totalVacationDays);  
console.log(Employee.generateTempPassword()); 

output:

20
7452        //generates any random number between 0 and 100000