A simple example of JavaScript prototypal inheritance

prototypal_inheritance.js

// Person class
function Person(name) {
  this.name = name;
}

// Adding getName method to its prototype
Person.prototype.getName = function () {
  return this.name;
}

// Creating a new instance of Person
var person = new Person('Allan');
console.log(person.getName()); // Allan

// Develper class which inherit from Person
function Developer(name) {
  // Calling Person constructor
  Person.call(this, name);
}

// Setting Developer prototype from a new object based on Person prototype
Developer.prototype = Object.create(Person.prototype);

// Creating new instance of Developer
var dev = new Developer('JavaScript');
console.log(dev.getName()); // JavaScript