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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