Classes in JavaScript

In object-oriented programming, classes is a great feature, it also help in creating many objects of same kind. Syntax:

class MyClass {
  // class methods
  constructor() { ... }
  method1() { ... }
  method2() { ... }
  ...
}

Example 1: Create class

class Student {
    constructor(name) {
        this.name = name;
    }
    welcome() {
        console.log(this.name);
    }
}
let student = new Student("Ankit"); //object called, constructor created
student.welcome();

new Student("Ankit").welcome(); //can be called without variable

Using new keyword, object is created and its constructor called automatically. In JavaScript, a class is a kind of function.

console.log(typeof Student); // function

Just like functions, classes can be defined inside another expression,

Example 2: Class Expression

let student = class Student {
    welcome() {
        console.log('Welcome Student');
    }
}
new student().welcome();

Just like literal objects, classes may include getters/setters to compute properties.

class Student {
    constructor(name) {
        this.name = name; //invokes the setter
    }
	get name(){
		return this._name;
	}
	set name(value){
		this._name = value;
	}
}
let student = new Student("Ankit"); //object called, constructor created
console.log(student.name); //invokes the getter