Duplicate code smell

Duplicated code is the smelliest of the code smells. The book Refactoring Martin Fowler 1999 states that: "If you see the same code structure in more than one place, you can be sure that your program will be better if you find a way to unify them." Martin Fowler 1999 states that the simplest duplicated code problem is when you have the same expression in two methods of the same class.

Apply Extract Method

See also

• Extract Method
• Don't repeat yourself
• Once and only once
• Code smells
• Refactoring