Exercises

Lets practice the following exercise:

  1. Create an object called shape that has the type property and a getType() method.
  2. Define a Triangle() constructor function whose prototype is shape. Objects created with Triangle() should have three own properties-a, b, and c, representing the lengths of the sides of a triangle.
  3. Add a new method to the prototype called getPerimeter().
  4. Test your implementation with the following code:
            > var t = new Triangle(1, 2, 3); 
        > t.constructor === Triangle; 
               true 
        > shape.isPrototypeOf(t); 
               true 
        > t.getPerimeter(); 
               6 
        > t.getType(); 
               "triangle"
  5. Loop over t, showing only your own properties and methods, none of the prototype's.
  6. Make the following code work:
            > [1, 2, 3, 4, 5, 6, 7, 8, 9].shuffle(); 
          [2, 4, 1, 8, 9, 6, 5, 3, 7]
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