JavaScript Class super

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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 »