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What does reconstruction mean?

Xiamen Jingwei Yingchuang explained:

The result of refactoring is to refer to shortcut methods, remove duplicate code and dead code, and make the design and logic clearer. Is to use programming languages better and smarter. Is to use the information you know now, but the development programmers at that time didn't know-or didn't use it. Constantly simplify the code to make it easier to understand.