This blog post will be a brief introduction to inheritance in classes.
To create an instance of a class, we use the new keyword. If we would like to inherit from a base class, then we can use the extends keyword.
class Person {
name;
age;
constructor(name) {
this.name = name;
this.age = 33;
}
getName() {
return this.name;
}
}
// creating new instance of a class Person
const person = new Person("Parwinder");
console.log(person.getName()); // Parwinder
To extend the Person class, let's use extend.
class Person {
name;
age;
constructor(name) {
this.name = name;
this.age = 33;
}
getName() {
return this.name;
}
}
const person = new Person("Parwinder");
console.log(person.getName()); // Parwinder
class Female extends Person {
gender;
constructor(name) {
super(name);
this.gender = "Female";
}
}
const female = new Female("Lauren");
console.log(female.getName()); // Lauren
console.log(female instanceof Female); // true
console.log(female instanceof Person); // true
super keyword allows us to use the parent class constructor. We can also use super to call a method from the parent/base class.
Classes in ES6 support:
- prototypical inheritance,
super- instance and static methods.
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