For most programmers, writing program code may be a pleasure, but I believe more people regard reading program code written by others as a daunting task. Many people would rather rewrite their own program code than accept other people's program code, and then correct, maintain and even enhance their functions.
brief introduction
What's the key to this? If you hit the nail on the head, it's actually very simple. The program code was written by others, and only the original author really understands the purpose and significance of the program code. Many programmers have an unconscious fear of being forced to touch the program code written by others. This comes from the primitive fear of strange things in the depths of human hearts.
However, for many practical reasons, programmers are often forced to accept other people's program codes. For example, if a colleague leaves, he must take over the job he left behind; It is also possible that you are a rookie who just entered the department, and your colleagues' experience has been enough and improved. The wind and water have turned, and a generation of rookies has changed to a group of rookies. Even, the project your company undertakes must take over or integrate the system left by the customer's previous manufacturer, and you only have the original code of that system (with luck, there are different numbers of documents).