Super keyword in JavaScript?

Front End Technology Javascript Object Oriented Programming

Super

The super keyword is used to access and call functions on an object's parent. The super.prop and super[expr] expressions are legible in any method definition in both classes and object literals. It is used in the "extended" class, which uses "extends" keyword.

syntax

super(arguments);

Example

In the following example, the characteristics of a class called "Person" have been extended to another class called "Student". In both classes, we have used unique properties. Here "super" keyword is used to access a property from parent class(Person) to the extended class(Student), whereas "this" keyword is used to access extended class's own property.

<html>
<body>
<script>
   class Person {
      constructor(name, grade) {
         this.name = name;
         this.grade = grade;
      }
      goal() {
         return `${this.name} wants to become a crickter!`;
      }
      interest() {
         return `${this.name} interested in cricket !`;
      }
   }
   class Student extends Person {
      constructor(name, grade) {
         super(name, grade);
      }
      need() {
         return `${this.name} needs a cricket kit`;
      }
      career() {
         return `${super.interest()}
         ${super.goal()}
         ${this.need()}`;
      }
   }
   const student = new Student('Rishab pant', '7');
   document.write(student.career());
</script>
</body>
</html>

Output

Rishab pant interested in cricket !
Rishab pant wants to become a crickter!
Rishab pant needs a cricket kit

vineeth.mariserla

Updated on 17-Jun-2020 07:09:16

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