Refactoring

Refactoring is a form of editing whose goal is to improve readability while preserving meaning.

Code refactoring is the process of changing a computer program's internal structure without modifying its external functional behavior or existing functionality, in order to improve internal non-functional properties of the software, for example to improve code readability, to simplify code structure, to change code to adhere to a given programming paradigm, to improve maintainability, or to improve extensibility.

它并不改善程序执行的效率。