When You SHOULD Duplicate Code

Highlights

• The Single Responsibility Principle states that a given method/class/component should have a single reason to change

• repeats the same knowledge and business logic

• If you are not sure you can ask a replacement question: Does changing one code block lead to changing the other one?

• • Does code exist that looks identical? • Does the code repeat the same knowledge and logic

• Every piece of knowledge must have a single, unambiguous, authoritative representation within a system