JavaScript Classes

Classes are present in many programming languages. For using classes in Js, we use the class keyword. A class contains properties and methods. It supports constructor, to create some properties, inheritance etc. We use this keyword to use interact with methods and properties.

Eg:    // Human class

    class Human {

        constructor() {

            this.gender = "Male"    -> Property

        }

        printGender = () => {        -> Method

            console.log(this.gender);

        }

    }

    const newHuman = new Human();

    newHuman.printGender();

    // Inheritance

    class Person extends Human {

        constructor() {

            super();

            this.name = "Ayush"

            this.gender = "Female"

        }

        printMyName = () => {

            console.log(this.name);

        }

    }

    const newPerson = new Person();

    newPerson.printMyName();

    newPerson.printGender();

But, in modern JS, we can omit constructor and this keyword inside the constructor, also super, and directly create class.

Eg:   // Class without constructor keyword

     class Human {

      gender = "Male";

      printGender = () => {

        console.log(this.gender);

      };

    }