Exercises

Lets do the following exercise:

1. Implement multiple inheritance but with a prototypal inheritance pattern, not property copying. Here is an example:

           var my = objectMulti(obj, another_obj, a_third, { 
           additional: "properties" 
           }); 
   

   The additional property should be an own property; all the rest should be mixed into the prototype.

2. Use the canvas example to practice. Try out different things. Here are some examples:

   • Draw a few triangles, squares, and rectangles.

   • Add constructors for more shapes, such as Trapezoid, Rhombus, Kite, and Pentagon. If you want to learn more about the canvas tag, create a Circle constructor too. It will need to overwrite the draw() method of the parent.

   • Can you think of another way to approach the problem and use another type of inheritance?

   • Pick one of the methods that uses uber as a way for a child to access its parent. Add functionality where the parents can keep track of who their children are, perhaps using a property...