Concise, more readable code: a summary of practical experience in code refactoring and design patterns

Code refactoring and design patterns are important means to improve code quality, readability and maintainability. They help developers optimize code structure, reduce code duplication, increase code scalability, and draw on classic solutions and design principles. The following will summarize some experiences in code refactoring and design patterns to help you write simpler and more readable code

1. Summary of experience in code refactoring

The rewritten content is as follows: 1. Extract Method: When a method is too long or the function is too complex, part of the logic can be extracted into a new method. The extraction method can improve the readability and reusability of the code, and make the main method more focused on the core logic

2. Split Loop: When processing in a loop When there are multiple different logics, you can consider splitting them into multiple independent loops. This can reduce the complexity of each loop, make the code more readable, and facilitate subsequent optimization and adjustment

3. Consolidate Duplicate Code: If there is Multiple repeated fragments can be extracted into a common method or function to avoid writing similar code repeatedly. Merging duplicate code can improve the maintainability of the code and reduce the occurrence of errors

4. Add function parameters (Add Parameter): When a method needs to access local variables in another method , you can pass it in by adding parameters. This reduces dependencies between methods and improves code flexibility and testability.

5. Interface extraction: If a class implements multiple interfaces, and some of the methods are only used in specific scenarios, you can consider extracting these methods to a new in the interface. This can avoid redundant and bulky interfaces, and make the code clearer and easier to maintain

#6. Rename variables and methods (Rename Variable/Method): Give variables and methods a A meaningful name better expresses its meaning. By renaming, you can improve the readability and understandability of your code and reduce the occurrence of misunderstandings and errors.

Extract Superclass: When multiple classes have similar attributes and methods, their common parts can be extracted to form a superclass. This can avoid code duplication and improve code reusability and scalability

2. Experience summary of design patterns

The rewritten content is as follows: 1. Single Responsibility Principle (SRP): A class should have only one reason for its change. Splitting different functions into independent classes can improve the cohesion and maintainability of the code

2. Open-Closed Principle (OCP): software entity (Classes, modules, functions, etc.) should be open for extension and closed for modification. By designing code in an abstract and polymorphic manner, modifications to existing code can be reduced and the scalability and reusability of the code can be improved. Rewritten content: 2. Open-Closed Principle (OCP): Software entities (classes, modules, functions, etc.) should be allowed to be extended, but not modified. By using abstract and polymorphic methods to design code, you can reduce modifications to existing code and improve code scalability and reusability

3. Dependency Inversion Principle (Dependency Inversion Principle (DIP): High-level modules should not depend on low-level modules, but both should depend on abstractions. By adopting interface-oriented programming, the coupling between modules can be reduced and the flexibility and testability of the code can be improved.

4. Law of Demeter (LoD) ): An object should maintain minimal interaction with other objects. By encapsulating and limiting interactions between objects, you can reduce system complexity and improve code maintainability and testability.

5. Factory Pattern: Using the factory pattern can decouple the creation and use of objects. Creating objects through factory methods or abstract factories can dynamically replace specific implementations, improving code flexibility and scalability.

6. Singleton Pattern: Using the singleton pattern can ensure that a class has only one instance and provide a global access point. The singleton pattern can be used in scenarios where resources or state need to be shared and to control access to instances.

7. Observer Pattern: The Observer Pattern defines a one-to-many dependency relationship. When the state of the observed changes, all observer objects that rely on it will be notified. . The observer pattern can be used to decouple events and processing logic to improve system flexibility.

Through the experience summary of code refactoring and design patterns, we can optimize the code structure, reduce duplicate code, and use design patterns to improve the scalability and reusability of the code. These experiences and principles are all designed to make the code more concise and readable, thereby improving development efficiency and code quality. However, it is necessary to choose appropriate refactoring methods and design patterns according to specific scenarios and needs, and pay attention to keeping the code clear and easy to understand. Only by continuous learning and practice can we write more elegant, robust and maintainable code

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