[기술] Rob Pike의 프로그래밍 규칙 5가지

Rob Pike’s 5 Rules of Programming link

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• Rule 1. You can’t tell where a program is going to spend its time. Bottlenecks occur in surprising places, so don’t try to second guess and put in a speed hack until you’ve proven that’s where the bottleneck is.
• Rule 2. Measure. Don’t tune for speed until you’ve measured, and even then don’t unless one part of the code overwhelms the rest.
• Rule 3. Fancy algorithms are slow when n is small, and n is usually small. Fancy algorithms have big constants. Until you know that n is frequently going to be big, don’t get fancy. (Even if n does get big, use Rule 2 first.)
• Rule 4. Fancy algorithms are buggier than simple ones, and they’re much harder to implement. Use simple algorithms as well as simple data structures.
• Rule 5. Data dominates. If you’ve chosen the right data structures and organized things well, the algorithms will almost always be self-evident. Data structures, not algorithms, are central to programming.

Pike’s rules 1 and 2 restate Tony Hoare’s famous maxim “Premature optimization is the root of all evil.” Ken Thompson rephrased Pike’s rules 3 and 4 as “When in doubt, use brute force.”. Rules 3 and 4 are instances of the design philosophy KISS. Rule 5 was previously stated by Fred Brooks in The Mythical Man-Month. Rule 5 is often shortened to “write stupid code that uses smart objects”.

출처: http://users.ece.utexas.edu/~adnan/pike.html

사실은 6번째 규칙이 있는데, 6번째 규칙이 없다는 것이 6번째 규칙이다(?). 위 출처처럼 규칙을 5가지로 소개하는 경우가 왕왕 있는데 Rob Pike는 이에 대해서 불쾌해 한다.

People keep quoting my '5 Rules of Programming'. Actually there were (and still are) 6 rules.

— Rob Pike (@rob_pike) May 21, 2018