Mastering JavaScript Object-Oriented Programming

ES6 inheritance

The class construct introduced by the ECMAScript 6 specifications also brings a new way to define inheritance. Using a syntax similar to most common classical Object-Oriented Programming languages, we can make a class inherit from another one. Let's take the previous example of person and developer and rewrite it using classes:

class Person { 
  constructor(name, surname) { 
    this.name = name; 
    this.surname = surname; 
  } 
} 
 
 
class Developer extends Person { 
  constructor(name, surname, knownLanguage) { 
    super(name, surname); 
    this. knownLanguage = knownLanguage; 
  } 
} 

In this example, we have highlighted the relevant parts of inheritance. As we can see, the class Developer inherits from the class Person using the extends keyword. Moreover, in ...