1. Extract function: extract a piece of code with the same logic into a single function to reduce code duplication and improve code readability.
2. Merging functions: Merging multiple functions with the same logic into one function to reduce the number of function calls and improve the readability of the code.
3. Rename variables and functions: Use meaningful names instead of incomprehensible variables and functions to improve the readability of the code.
4. Move constants and literals: Move constants and literals into the code blocks they actually use to reduce code redundancy and improve code readability.
5. Simplify conditional statements: replace complex nested conditional statements with simple conditional statements to improve the readability of the code.
6. Optimize loop: replace complex loop structure with more efficient loop structure or algorithm to improve code performance.
7. Use standard library functions: Use standard library functions instead of custom functions to improve the readability and maintainability of the code.
When refactoring code, you need to pay attention to the following points:
* Refactoring should be a planned behavior, not a random modification.
* Refactoring should follow certain rules and standards to ensure the correctness and consistency of the code.
* Refactoring should be done carefully to avoid introducing new errors and problems.