feature envy code smell example

Feature Envy is a Code Smell which occurs in methods. Yesterday I wrote about a Code Smell called Data Class. The question is, what's the best way to fix it? The two method level code smells used to detect them are long method and feature envy. Treatment. This code smell is part of the much bigger Refactoring Course. Pour détecter le code smell Feature Envy, il faut être capable de localiser les méthodes utilisant trop les méthodes d’une classe extérieure. Couplers All the smells in this group contribute to excessive coupling between classes or show what happens if coupling is replaced by excessive delegation. Methods suffer from Feature Envy, if they use other classes more than their own. A method accesses the data of another object more than its own data. Then place the method in this class along with the other data. Long Method (LM): A code smell is said to be long method when it has more number of lines in the code and requires too many parameters. Please sound off your comments below. In this article, we look at more code smells in JavaScript code, including feature envy, and classes that are too intimate. I understand that is an example of the "feature envy" code smell. Today’s topic is ‘Feature Envy’, a code smell and an indicator of deeper problems with the software. Code often needs collaborators. Apart from the difficulty of having to keep a lot of complex logic in mind whilst reading through a long method, it is usually a sign that the method has too many responsibilities. Consider the following function: Code Smells. The class uses a significant number of methods and fields of other Class (being used more than the class where it is defined). In our last article, we understood about couplers with the smell of Inappropriate Intimacy. CODE SMELL/ BAD SMELL Types of Code Smell Feature Envy The whole point of objects is that; they are kind of technique that package data with the processes used on that data. The user of the rectangle may need to know its area. Your email address will not be published. The question is, what's the best way to fix it? If two or more methods are always talking to one another, chances are they must be part of the same class. A method accesses the data of another object more than its own data. Your email address will not be published. These metrics became features for independent variables in the datasets. Feature envy smells come under a category called ‘Couplers’. "The whole point of objects is that they are a technique to package data with the processes used on that data. They describe code in need of refactoring in rich language such as 'Speculative Generality', 'Inappropriate Intimacy' or 'shotgun surgery'. Each method should do one task at a time. A method has Feature Envy on another class, if it uses more features (i.e. Long Method (LM): A code smell is said to be long method when it has more number of lines in the code and Less code duplication (if the data handling code is put in a central place). Have you ever heard of the "feature envy" code smell? If only part of a method accesses the data of another object, use Extract Method to move the part in question. For example: Comments, Duplicate Code, Lazy Class, Data Class, Dead Code, Speculative Generality. Usually these smells do not crop up right away, rather they accumulate over time as the program evolves (and especially when nobody makes an effort to eradicate them). Feature Envy Introduction. Feature Envy: Methods that make extensive use of another class may belong in another class. In object-oriented programming, there are multiple means of making classes that can interact with each other like using composition, aggregation, and inheritance. Feature Envy means that one class is ‘envious’ of, and contains, behaviour that rightly belongs to another. The problem with that, as usual, is the way your logic gets spread around between multiple classes. Martin Fowler, the inventor of Code Smells and Feature Envy, puts it like this: Consider moving this method to the class it is so envious of. When a method seems more interesting in a class, other than the one in actually it is. The Data Class smell looks at the problem from the producer’s perspective, while Feature Envy looks at the problem from the consumer’s perspective. The behaviour implemented in the client should be moved over to the collaborator. Usually data and functions that use this data are changed together (although exceptions are possible). The class under question wants to be the other class so bad, it uses its methods excessively. For another meaning, see FeatureEnvy. One class jealous of another. It was very compelling. Lavori. Everyone loses in the "what if.." school of design. Today’s code smell is feature envy. Feature envy is when one class uses the methods of another class to excess. Code Smells. It is bad, because inevitably provokes either Feature Envy, as you point our or just plain violations of Encapsulation. In other cases, smells come from some recurring, poor design solutions, also known as anti-patterns [9]. A classic [code] smell is a method that seems more interested in a class other than the one it is in. These are what we could consider as potential bad practices. Problem: a class may be using too much functionality from the of... Are similar in concept to Development-level Antipatterns `` problems '' are, however, solutions! Language such as 'Speculative Generality ', 'Inappropriate Intimacy ' or 'shotgun surgery ' Kent Beck on WardsWiki in application. Kent Beck on WardsWiki in the `` problems '' are, however, the client should be moved another... 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