This course has been updated! We now recommend you take the JavaScript Performance course.

Check out a free preview of the full Website Performance course:
The "Exercise 4" Lesson is part of the full, Website Performance course featured in this preview video. Here's what you'd learn in this lesson:

The point of this exercise is to look at some object oriented JavaScript code and apply some performance testing. Identify the classes that have composition relationships and which classes have substantive object oriented behavior. Can you modify the code to remove inheritance and abstraction to improve performance?

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