Inheritance and Modules

I've learned that the major difference between these to tools is the use case. Inheritance I will use if I need to instantiate a class and then the next class I use builds off that previous class(I want it to mimic a 'parent-child' relationship). Whereas modules I would use when I didn't need to instantiate and instance.

I have found that this is best used for calculations that are used across multiple classes. An example might be a total calculation. That can be used in multiple classes. Instead of writing out this total calculation for every class I need it in I can create a module that holds my method and then have my classes call on that one total method to find my totals.

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