Prototypes in Javascript

javascript prototypes.js

var person = { kind : ‘person’ };
var shaun = Object.create(person);

person.isPrototypeOf(shaun); // true

person.kind // 'person'
shaun.kind // 'person'

shaun.sayHello = function(){ console.log(‘Hello’) };

// since the object shaun's prototype points to person, then person // will not inherit from the person object but any further objects // created via Object.create(shaun) will have access to this method
person.sayHello(); // UncaughtTypeError

var cloneShaun = Object.create(shaun);
cloneShaun.prototype // undefined

shaun.isPrototypeOf(cloneShaun); // true
shaun.hasOwnProperty('sayHello'); // true

// define People using a constructor function
function People(peeps) { this.people = peeps; };

// create an instance of People
var group = new People([‘person_1’, person_2’]);

group.people; // [‘person_1’, person_2’]

// Every instance that was created via the constructor function
// will now have this property available 
People.prototype.getPeople = function() { return this.people; };

group.getPeople(); // [‘person_1’, person_2’]