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The Complete Guide to Modern JavaScript

Classes

In this lesson you'll learn a clearer way of doing prototype inheritance in ES6.

We'll cover the following...

Quoting MDN:

“Classes are primarily syntactic sugar over Javascript's existing prototype-based inheritance. The class syntax does not introduce a new object-oriented inheritance model to JavaScript.”

That being said, let’s review prototypal inheritance before we jump into classes.

Javascript (babel-node)
function Person(name,age) {
  this.name = name;
  this.age = age;
}
Person.prototype.greet = function(){
  console.log("Hello, my name is " + this.name);
}
const alberto = new Person("Alberto", 26);
const caroline = new Person("Caroline",26);
alberto.greet();
// Hello, my name is Alberto
caroline.greet();
// Hello, my name is Caroline

We added a new method to the prototype in order to make it accessible to all the new instances of Person that we created.

Ok, now that I refreshed your knowledge of prototypal inheritance, let’s have a look at classes.

 

Create a class #

There are two ways of creating a ...