DrawableEntityBase -- taken from https://github.com/AlphaGit/random-javascript/blob/90e6540100631e1a3ae590c3bde4a21b74f7abd9/arkanoid-canvas/arkanoid.js

DrawableEntityBase.js

// DrawableEntityBase
function DrawableEntityBase(drawingContext, color) {
    if (!drawingContext) throw "A drawing context needs to be provided.";

    this.ctx = drawingContext;
    this.color = color;
    
    this.draw = function() {
    	throw "DrawableEntityBase is an abstract class -- needs an implementation!"
    };
    
    return {
    	draw: this.draw
    };
}