Are we done on code smells? Probably never! We see several symptoms and situations that make us doubt the quality of our development. Let's look at some possible . solutions Most of these smells are just hints of something that might be wrong. They are not rigid rules. This is part V. Part I can be found , Part II , Part III is , and Part IV . here here here here Let's continue... Code Smell 21 - Anonymous Functions Abusers Functions, lambdas, closures. So high order, nondeclarative, and hot. Photo by Roman Mager on Unsplash Problems Maintainability Testability Code Reuse Implementation Hiding Debugging Solutions Wrap functions/closures Reify algorithms in method object / Strategy Sample Code Wrong Right Detection Closures and anonymous functions are very useful to model , etc. So It'd difficult to tear them apart. code blocks promises Tags Primitive Abuser Conclusion Humans read code. Software works ok with anonymous functions but maintainability is compromised when multiple closures are invoked. Object-oriented programming increases the value of these metrics by managing this complexity. The most effective tool available for dealing with complexity is abstraction. Many types of abstraction can be used, but encapsulation is the main form of abstraction by which complexity is managed in object-oriented programming. Rebecca Wirfs-Brock Code Smell 22 - Helpers Do you need help? Who are you gonna call? Problems Readability The Least surprise principle Fault Bijection Static methods Solutions Find a suitable name If the helper is a library, break all the services as different methods. Methods should always be fulfilled by objects. are another code smell. Static methods Avoid extracting the helpers to . Anonymous Functions Sample Code Wrong Notice methods. static Right Or we can make the former stateless for reuse... Helper Detection Code naming standards should forbid classes with this name on them. Tags Namings Conclusion This is a well established cultural name and a legacy habit from structured programming. Most developers are reluctant to let old habits go. We must be aware of the damage this kind of names are bringing us. Also known as Utils More Info How to Decouple a Legacy System Code Smell 23 - Instance Type Checking Do you check who are you talking to? Photo by Remy Gieling on Unsplash Problems Coupling Meta model interference IFs Solutions Avoid , , , , , etc.. kind isKindOf instance getClass() typeOf Don't use Reflection and for Domain Objects. Metaprogramming Replace with polymorphism. IFS Avoid checking for . Use , avoid and setters, favor and you will never have undefined and ifs. 'undefined' complete objects nulls immutability How to Get Rid of Annoying IFs Forever Sample Code Wrong Right Detection Since type checking methods are well known it is very easy to set up a code policy checking the uses. Tags Metaprogramming Conclusion Testing for a class type the objects with and violates since no such control exists on real world. It is a smell our models are not good enough. couples accidental decisions bijection More Info How to Get Rid of Annoying IFs Forever Code Smell 24 - Boolean Coercions Booleans should be just True and False Problems Hiding Errors Accidental complexity coupled to one particular language. Readability Difficulty to hop among languages. IFs Solutions Be explicit. Work with booleans for boolean conditions. Not integers, not , not strings, not lists. Just booleans. nulls Fail fast Sample Code Wrong Right Detection This is a language feature. Some strict languages show warnings with this magic wizardry. Tags Coercions Primitive Conclusion Some languages encourage doing some magic abbreviations and automatic castings. This is a source of errors and a warning. Premature Optimization We should always be as as possible. explicit More Info Fail Fast Philosophy, Explained It is not the language that makes programs appear simple. It is the programmer that make the language appear simple! Robert Martin Code Smell 25 - Pattern Abusers Patterns are awesome. With great powers comes great responsibility Photo by Nathan Dumlao on Unsplash Problems Over Design Readability Solutions Measure the trade-off of patterns usage. Create solutions based on real world names ( ) over architecture (accidental). essential Choose . good names User technique to find real entities. MAPPER bijection Sample Code Wrong Right Detection It would be very difficult to create automatic detection rules. A class name with more than one pattern on it, is a warning. Tags Abuser Naming Conclusion Chose when to apply a pattern solution. You are not for using too many patterns. You are smart if you choose the right opportunity for everyone. smarter More Info Singleton Pattern: The Root of All Evil How to Decouple a Legacy System What Exactly Is A Name: Rehab [Part II] When you have a hammer, every problem looks like a nail. Will it be the end? Are we done? Guess not!

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