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Clearly, at some level comments have to be useful. To believe otherwise would be to believe that the comprehensibility of a program is independent of how much information the reader might already have about it. B. A. Sheil
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Cool down, Thrasymachus. Ask Callicles how long he s been programming. How long, Callicles Well, I started on the Acropolis IV about 15 years ago. I guess I ve seen about a dozen major systems from the time they were born to the time we gave them a cup of hemlock. And I ve worked on major parts of a dozen more. Two of those systems had over half a million lines of code, so I know what I m talking about. Comments are pretty useless. Socrates looked at the younger programmer. As Callicles says, comments have a lot of legitimate problems, and you won t realize that without more experience. If they re not done right, they re worse than useless. Even when they re done right, they re useless, Callicles said. Comments are less precise than a programming language. I d rather not have them at all. Wait a minute, Socrates said. Ismene agrees that comments are less precise. Her point is that comments give you a higher level of abstraction, and we all know that levels of abstraction are one of a programmer s most powerful tools. I don t agree with that. Instead of focusing on commenting, you should focus on making code more readable. Refactoring eliminates most of my comments. Once I ve refactored, my code might have 20 or 30 routine calls without needing any comments. A good programmer can read the intent from the code itself, and what good does it do to read about somebody s intent when you know the code has an error Glaucon was pleased with his contribution. Callicles nodded. It sounds like you guys have never had to modify someone else s code, Ismene said. Callicles suddenly seemed very interested in the pencil marks on the ceiling tiles. Why don t you try reading your own code six months or a year after you write it You can improve your code-reading ability and your commenting. You don t have to choose one or the other. If you re reading a novel, you might not want section headings. But if you re reading a technical book, you d like to be able to find what you re looking for quickly. I shouldn t have to switch into ultra-concentration mode and read hundreds of lines of code just to find the two lines I want to change. All right, I can see that it would be handy to be able to scan code, Glaucon said. He d seen some of Ismene s programs and had been impressed. But what about Callicles other point, that comments get out of date as the code changes I ve only been programming for a couple of years, but even I know that nobody updates their comments.
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Well, yes and no, Ismene said. If you take the comment as sacred and the code as suspicious, you are in deep trouble. Actually, finding a disagreement between the comment and the code tends to mean that both are wrong. The fact that some comments are bad doesn t mean that commenting is bad. I m going to the lunchroom to get another pot of coffee. Ismene left the room. My main objection to comments, Callicles said, is that they re a waste of resources. Can anyone think of ways to minimize the time it takes to write the comments Socrates asked. Design routines in pseudocode, and then convert the pseudocode to comments and fill in the code between them, Glaucon said. OK, that would work as long as the comments don t repeat the code, Callicles said. Writing a comment makes you think harder about what your code is doing, Ismene said, returning from the lunchroom. If it s hard to comment, either it s bad code or you don t understand it well enough. Either way, you need to spend more time on the code, so the time you spend commenting isn t wasted. All right, Socrates said. I can t think of any more questions, and I think Ismene got the best of you guys today. We ll encourage commenting, but we won t be naive about it. We ll have code reviews so that everyone will get a good sense of the kind of comments that actually help. If you have trouble understanding someone else s code, let them know how they can improve it.
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