I'd actually say that a documentation is only needed for external api's/interfaces...
A documentation for every single line of code or just every function is just too much. Too much that anyone could make any use of... I actually think that navigating and reading the code should be easy enough to be understood by any developer... If it's not, you should try to code differently.
I agree that you can figure out anything but the question is what amount of time it takes. Developers spend around 60% of time actually writing the code and the rest of the time, it's figuring out the logic and understanding the code.
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I'd actually say that a documentation is only needed for external api's/interfaces...
A documentation for every single line of code or just every function is just too much. Too much that anyone could make any use of... I actually think that navigating and reading the code should be easy enough to be understood by any developer... If it's not, you should try to code differently.
I agree that you can figure out anything but the question is what amount of time it takes. Developers spend around 60% of time actually writing the code and the rest of the time, it's figuring out the logic and understanding the code.