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HTML5 Canvas Apprenticeship Video Series - Part 1

Welcome back again.  Just a short update on videos.  I have started publishing videos on HTML5 Canvas Apprenticeship.  The series of videos will take you  from 0 to mastering HTML5 canvas element in no time.

All the source code for this series is available on github @

Preview the first part here which cover the introduction to the series.


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JavaScript - The this keyword

"this" is one of the most misunderstood construct in JavaScript.  To understand this first lets go through how to create a construction function in JavaScript.  A constructor function is a function which is used to create instances of objects in JavaScript.

You define a constructor function using the same notation that you use to define a normal JavaScript function.  The convention to follow is to capitalize the first letter of the function name.

This requirement is not enforced by the JavaScript language but it is a generally accepted practice and there are many benefits which we will shortly discuss.

Let's define a constructor function to hold our menu information.

function Menu() { }
So, in the above snippet you have a constructor function named Menu defined. At present this function doesn't do anything good.

Let's see how to invoke this function

var menu = new Menu();
Let's add some public properties to this function.
function Menu() { this.menuName = &…