Inheritance is one of Object the concept in Oriented Programming. In this post we will learn how to achieve inheritance in JavaScript.Inheritance is a concept of acquire properties of one class with other class, here the clasess are called parent and child classes. This is the most important topic in object oriented programming. In this post we will learn inheritance in javascript with ES6. In ES6 Inheritance works with using the extends and super keyword.
Features of Inheritance
Writing reusable code in parent class and reuse in child class
Below example shows simple inheritance in javascript
class Mobiles {
constructor(name, price) {
this.name = name;
this.price = price;
}
printName() {
console.log(this.name);
}
printPrice() {
console.log(this.price);
}
}
// * Moving from Generalisation to Specialization
class TouchMobiles extends Mobiles {
constructor(name, price, touchSensitivity) {
super(name, price);
this.touchSensitivity = touchSensitivity;
}
printTouchSensitivity() {
console.log(this.touchSensitivity);
}
}
let androidP = new TouchMobiles('AndroidP', 200, 1.5);
androidP.printName();
androidP.printPrice();
androidP.printTouchSensitivity();
console.log('---------------------------------');
let normalPhone = new Mobiles('Normal Phone', 100);
normalPhone.printName();
normalPhone.printPrice();
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In the above example we created an object for the TouchMobiles() and accessed the properties of the Mobiles class and prin the details
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let androidP = new TouchMobiles('AndroidP', 200, 1.5); androidP.printName(); androidP.printPrice(); androidP.printTouchSensitivity(); |
Similarly we can directly create a parent class properties by create an object to Mobiles class
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let normalPhone = new Mobiles('Normal Phone', 100); normalPhone.printName(); normalPhone.printPrice(); |
Javascript inheritance example 2
class Employee {
doWork() {
console.log('Doing Project Work');
}
officeTimings() {
console.log('office Timings are 9:00 am - 6:00 pm');
}
}
class Manager extends Employee {
salery() {
console.log('Manager Salary is 50000');
}
}
let manager = new Manager();
let employee = new Employee();
manager.doWork(); // "Doing Project Work"
manager.officeTimings(); // "office Timings are 9:00 am - 6:00 pm"
manager.salery(); // "Manager Salary is 50000"
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Conclusion: In this example we covered how to work with inheritance in javascript with ES6 extends and super keyword.
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