Primitive Obsession

When you use plain built-in primitive types like string, int, float etc. It can be a sign you should have classes to represent domain concepts like money, co-ordinates, ranges, telephone numbers etc. If you use primitives you risk mistakes like adding inches to centimeters, or not being able to consistently display a phone number with or without its international code.

Sources

• This smell is included Martin Fowler's book "Refactoring", 2nd Edition

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