Q. What is Javascript?
A. An object-oriented computer programming language commonly used to create interactive effects within web browsers.
Q. What is Processing JS?
A. Processing.js is a JavaScript port of Processing, a programming language designed to write visualizations, images, and interactive content. It allows web browsers to display animations, visual applications, games and other graphical rich content without the need for a Java applet or Flash plugin.
The Introduction to JavaScript Drawing & Animation from Khan Academy.
Great example of Processing JS go to Processing JS.org exhibtion page.
Mr. G Old School Pong
This game uses Processing.js Library .
Much of this game came from Dillinger Lee, musicglass / AKA on github, the tutorial utilizes Khans Academy.
Debugging changing the background.