Code does not exist in a vacuum — even if it works right now, things might change a couple of years in the future. And if the code is a definition of spaghetti and nobody knows how any function works, then the code is unmaintainable and will take a lot more resources to update. Therefore, being able to write readable, well-documented code is necessary for any developer.
If you like this question & answer and want to contribute, then write your question & answer and email to freewebmentor[@]gmail.com. Your question and answer will appear on FreeWebMentor.com and help other developers.