JavaScript Prototypes and Inheritance

What is a prototype?

An object that exists on every function in JavaScript

Object's __proto__ is _____

null

What is this an example of? function Animal(voice){ this.voice = voice || 'grunt' } function Cat(name,color){ Animal.call(this,'Meow') this.color=color;this.name=name } Cat.prototype = Object.create(Animal.prototype) Cat.prototype.constructor = Cat

Inheritance

Add an age property to the Cat function's prototype function Cat(name,color){this.name=name;this.color=color}

Cat.prototype.age = 3

T/F a prototype is a class

False. It is an object

T/F Objects have a prototype property

False. Objects have a __proto__property

By default, all objects in javascript inherit from ____

Object

JavaScript inheritance is done through ____

Prototypes

I want to easily be able to get the last element of an array by doing myArray.last. This doesn't exist as a function of normal arrays in JavaScript. How could I do this?

Use prototypes to add a new function property to the array prototype Object.defineProperty(Array.prototype,'last', {get:function(){ this[this.length-1]; });