When you have to change the same class for different reasons — and each time a different part — you may have to deal with divergent change. They’re a diagnostic tool used when considering refactoring software to improve its design. Mutability was causing some of the confusion, so now that we’ve simplified the method to minimize mutability, let’s take a closer look at the rest of the code. Not all code smells should be “fixed” – sometimes code is perfectly acceptable in its current form. Consider alternative object-oriented approaches such as decorator, strategy, or state. Two contain a break, one a return. If you look at the class and say “well, I will have to change these 3 methods every time I get a new database, I have to change these 4 methods when month end process changes” you likely have a situation in which 2 classes is better than one. Phil Factor has continued to collect them and the current state of the art is reflected in this article. Divergent changes occurs when one class is commonly changed in different ways for different reasons. - Shotgun Surgery Code Smell It is the exact opposite of divergent change. This code smell is a little tricky to detect because this happens when a subclass doesn't use all the behaviors of its parent class. [F 80] Refused Bequest: This smell results from inheriting code you don't want. The Smell: If Statements. Code Smells. Find them and removing or replacing them is very important for the overall quality of the code. Bonus Code Smell Of The Week - Divergent Change (Clean Separation) So once again with the Account example, only this time the two concerns (account logic and XML serialization) are cleanly seperated so that Account has zero knowledge of it. Code smells, or bad smells in code, refer to symptoms in code that may indicate deeper problems. Code smells occur when code is not written using fundamental standards. Removing code smell is an important task and can be done using automated code review tools. 1. I'm often asked why ... Watch out for large conditional logic blocks, particularly blocks that tend to grow larger or change significantly over time. But when shotgun surgery code smell is present, when a single change is made to multiple classes when there is excessive coupling between the classes and a single responsibility is shared among multiple classes. Looking at the code above, you can see 11 different if statements, many of which check more than one condition. This smell is evident when you must change lots of pieces of code in different places simply to add a new or extended piece of behavior. Detecting Code Smells This code smell will make you change many classes for one single reason which means that many classes have the same reason to change in order to apply one behaviour. 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