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>Computers are so fast and cheap today a lot of this doesn't matter most of the time.

Indeed, yet since it's emphasized so much in college people prioritize this over cleanliness and architectural elegance which matters much more.

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Depends (like most of these generalizations) on your college and teachers. I had two professors who hammered the point that the priorities are: clarity, correctness, and performance. In that order. Perhaps a bit dogmatic, but a useful idea.

We would often spend class time writing cleaner, simpler code after arriving at a correct answer.

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