Javascript calling prototype functions in constructor

Question

I keep getting an error saying that my functions are not defined when I was trying to call the prototype functions in the constructor and I dont know whats wrong with it.

Here's the code I have:

function Renderer() {     initialiseWebGL();     initialiseShader();     initialiseBuffer(); }  Renderer.prototype.initialiseWebGL() {     //Do stuff. };  Renderer.prototype.initialiseShader() {         //Do Shader's stuff };  Renderer.prototype.initialiseBuffer() {         //Do Buffers }; 

What is wrong with it?

Answer 1

Your syntax is wrong. Use this:

function Renderer() {     this.initialiseWebGL();     this.initialiseShader();     this.initialiseBuffer(); }  Renderer.prototype.initialiseWebGL = function () {     //Do stuff. };  Renderer.prototype.initialiseShader = function () {         //Do Shader's stuff };  Renderer.prototype.initialiseBuffer = function () {         //Do Buffers }; 

After that you can create new object and use it by:

var rendererInstance = new Renderer(); 

Answer 2

There are a few things wrong with your Code

1.initialiseWebGl() would look for a function declared in the Global scope -> there is no function

• You should use this.initialiseWebGl() to access the Objects Method
  Note: this refers to the Instance of Renderer in this case

2.You are not assigning a function with Renderer.prototype.initialiseWebGL() instead you try to invoke the Renderers prototype method initialiseWebGl which gives you an error, as its not defined

3.Because the { are moved down a line they get interpreted as a Block -> this code gets executed.
If you'd had them after your () you would get a Syntax Error -> Renderer.prototype.initialiseWebGL() {... would result in Uncaught SyntaxError: Unexpected token {

Heres an Commented Example

function Renderer() {     initialiseWebGL(); // I call the global declared function     this.initialiseShader(); //I call the Prototypes function     this.initialiseBuffer(); //Me too }  Renderer.prototype.initialiseWebGL = function (){ //Here a function gets assigned to propertie of `Renderer`s `prototype` Object     //Do stuff. };  Renderer.prototype.initialiseShader = function (){         console.log("Do Shader Stuff"); };  Renderer.prototype.initialiseBuffer = function (){         console.log("Do initialise stuff"); };  Renderer.prototype.initialiseBuffer() // I invoke the method above {  console.log("I'm a Block statement"); };   function initialiseWebGL () { //I'm the global declared function   console.log("Global"); }  var ren1 = new Renderer();  /*"Do initialise stuff"   "I'm a Block statement"   "Global"   "Do Shader Stuff"   "Do initialise stuff"*/ 

As you can see in the consoles Output

Heres a JSBin