It is critical for a developer to include well-written documentation about what each function in the code does for the following reasons:
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Facilitates Collaboration: So that others working on a different part of the overall project are able to write code that interacts with their work. Good documentation helps team members understand how to effectively use and integrate their components with existing code, which is essential for collaboration in team environments.
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Improves Maintainability: Well-documented code is easier to maintain and update over time. This allows new developers (or even the original developers after some time) to quickly understand the purpose and functioning of various functions, greatly reducing the time required for updates or debugging.
These two points emphasize the importance of documentation for both teamwork efficiency and long-term project sustainability.