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You may have heard the saying prefer composition over inheritance. The advice is a little vague, so Im going to break it down. What is composition, inheritance and why would you prefer one over the other? Both composition and inheritance are trying to solve the same problem. You have a piece of code that youre trying to reuse. Inheritance is when you have a class that contains functionality you want to reuse. So you create a subclass extending its functionality. If you simply extend a class, youve basically created a copy of the class with a new name, and then you can inject new methods to extend or override parts. We have a rudimentary image class here. It represents an RGB image and stores it as a double array of pixels. The image class hides how the image is stored in memory and provides a method for looking up pixel values. We also have some stuff we can do to the image. We have a resize method which resizes the image by a scale factor, and we have methods to flip the image hor