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# Refactoring
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Refactoring is very important in relation to these topics. Just as important as
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the other topics covered here, is how to take good code and turn it into great
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code.
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We can use [design patterns](../patterns/index.md) to [DRY] up code and
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generalize abstractions. We must avoid
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[anti-patterns](../anti_patterns/index.md) while we do this. While they may be
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tempting to employ, their costs outweigh their benefits.
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> Shortcuts make for long days.
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We can also use [idioms](../idioms/index.md) to structure our code in a way that
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is understandable.
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## Tests
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Tests are of vital importance during refactoring.
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## Small changes
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[DRY]: https://en.wikipedia.org/wiki/Don%27t_repeat_yourself
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