The two critical reasons for a developer to include well-written documentation about what each function in the code does are:
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So that others working on a different part of the overall project are able to write code that interacts with their work. – This ensures collaboration and integration within the team, making it easier for developers to understand how different components of the project interact.
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So that someone who buys the software knows how to use it. – This helps the end-users understand how to effectively utilize the software, enhancing user experience and satisfaction.
Both points highlight the importance of documentation in fostering collaboration and usability.