Several metrics show that the improvements reduced complexity. In 4) a system was improved in two steps resulting in three variants of the same system. Though hypotheses 2 and 3 are not true by definition but they can be regarded intuitively clear. If the solution cannot be implemented quickly, it is not simple.
fewer defects show up after releasing the software.Īll these hypotheses can be examined with respect to different complexity metrics. Simpler solutions yield more reliable software, i.e. Profile before optimizing), which make sense: to optimize only the code with performance problems. Pareto principle applies also in code: a program spends most of the time in a small portion of the code, so it will be wise to concentrate the effort to optimize only that part of the code. An optimized code is a more complex code. That sounds reasonable, if you happen to be a psychic.” - Refactoring To Patterns - Joshua Kerievsky.Īnother reason to create more complex code is to make optimizations. The reason that it's best to make a design more flexible or sophisticated today is to accommodate the needs of tomorrow. Some do this because they believe they know their system's future requirements. “When you make your code more flexible or sophisticated than it needs to be, you over-engineer it.
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But one cannot know how to make it flexible or if that flexibility will be ever needed. One reason to create more complex code is to make it more flexible to accommodate further requirements. So simple and stupid programs are easier to maintain because the maintainer needs less time to understand them and is less likely to introduce further defects. The maintainer might also be less familiar with sophisticated programming language features.
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The advantage of simplicity is even more significant when the person who maintains the software is not the one who once wrote it. Furthermore, writing simple code is less error-prone. This includes increased readability, understandability, and changeability. A simpler solution is better than a complex one because simple solutions are easier to maintain.
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