Another way of organizing functions together is Combine Functions into Transform (149). Which one to use depends more on the broader context of the program. One significant advantage of using a class is that it allows clients to mutate the core data of the object, and the derivations remain consistent. As well as a class, functions like this can also be combined into a nested function. Usually I prefer a class to a nested function, as it can be difficult to test functions nested within another. Classes are also necessary when there is more than one function in the group that I want to expose
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