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CSSStyleDeclaration JS Conversion


JavaScript Class super


Definition and Usage

The super keyword is used to call the constructor of its parent class to access the parent's properties and methods.

Tip: To understand the "inheritance" concept (parent and child classes) better, read our JavaScript Classes Tutorial.


Example

Create a class named "Model" which will inherit the methods from the "Car" class, by using the extends keyword.

By calling the super() method in the constructor method, we call the parent's constructor method and gets access to the parent's properties and methods:

class Car {
  constructor(brand) {
    this.carname = brand;
  }
  present() {
    return 'I have a ' + this.carname;
  }
}

class Model extends Car {
  constructor(brand, mod) {
    super(brand);
    this.model = mod;
  }
  show() {
    return this.present() + ', it is a ' + this.model;
  }
}

mycar = new Model("Ford", "Mustang");
document.getElementById("demo").innerHTML = mycar.show();

Try it Yourself »


Browser Support

super is an ECMAScript6 (ES6) feature.

ES6 (JavaScript 2015) is supported in all modern browsers:

Chrome Edge Firefox Safari Opera
Yes Yes Yes Yes Yes

super is not supported in Internet Explorer 11 (or earlier).


Syntax

super(arguments);  // calls the parent constructor (only inside the constructor)
super.parentMethod(arguments);  // calls a parent method

Technical Details

JavaScript Version: ECMAScript 2015 (ES6)

Related Pages

JavaScript Tutorial: JavaScript Classes

JavaScript Tutorial: JavaScript ES6 (EcmaScript 2015)

JavaScript Reference: The extends Keyword

JavaScript Reference: The constructor() method