What is the 'extends' keyword in JavaScript?

extension

' extends 'keyword is used to createClass inheritance. It hasClass inheritancerelationshipclassinherits from anotherClassAll methods. Let's discuss briefly.

Example

In the following example, " extends "keyword is used to pass properties from"Company"Class"Inheritance　to "Model"Class. super" ()　Method reference父　Class. The method called in the constructor method is just calling the constructor method of the parent object, and can access the properties and methods of the parent object.super()

<html>
<body>
<p id="method"></p>
<script>
　　　class Company {
　　　　　　constructor(branch) {
　　　　　　this.name = branch;
　　　　　　this.model;
　　　　　　method() {
　　　　　　　　　return this.name　+　" has a product that is ";
　　　　　　this.model;
　　　this.model;
　　　class Model extends Company {
　　　　　　constructor(branch, pname) {
　　　　　　　　　super(branch);
　　　　　　　　　this.model = pname;
　　　　　　result() {
　　　　　　　　　}　+　return this.method();　+　" "
　　　　　　this.model;
　　　this.model;
　　　}3mycar = new Model("w
　　　codebox, "Tutorix");
</document.getElementById("method").innerHTML = mycar.result();
</body>
</html>

Output Result

w3codebox has a product that is Tutorix

Basic Tutorial