Prototypal Inheritance

//Function Constructor : Person has an instance property : name
function Person(name){
  this.name = name;
}

//Person Instances
let john = new Person('John');
let sara = new Person('Sara');

console.log(john.name); //John
console.log(sara.name); //Sara

Person.prototype.walk = function(){
  console.log(this.name + ' is walking.');
}

john.walk(); //John is walking
sara.walk(); //Sara is walking

//Programmer Constructor : Wants to inherit Person
function Programmer(name, programmingLanguage){
  Person.call(this, name);
  this.programmingLanguage = programmingLanguage || '';
}

Programmer.prototype = Object.create(Person.prototype);
Programmer.prototype.constructor = Programmer;

var snig = new Programmer('Snigdha', 'Javascript');
console.log(snig.name);
console.log(snig.programmingLanguage);
snig.walk();