Five Ways to Reduce the Size of Classes

Andrew Binstock writes that the best developers keep their classes to 50-60 lines of code. How can you do that? Here are five techniques:

1. Diminish the workload -- Each class should just one thing.
2. Avoid primitive obsession -- Don't use collections in their raw form.
3. Reduce the number of class and instance variables -- If you have a lot of variables, you can probably move a group of them to a separate class.
4. Subclass special-case logic -- If you have logic that isn't used very often, move it to a sub-class or a separate class.
5. Don't repeat yourself (DRY) -- Discipline yourself to avoid duplicate code in both the writing and the maintenance phases.

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