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+To conclude this lesson, I want to discuss the

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+concept of negative design patterns, that is, patterns that should

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+be avoided. Interestingly, negative patterns were also mentioned in

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+Christopher Alexander's book, so in the first formulation of patterns.

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+So negative design pattern are basically guidelines on how

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+not to do things. In consoles with patterns, the guidelines

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+on how to do things. So basically, what the negative

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+design patterns do is, they enable recurring design defects to

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+be avoided. And as we will see in this class extensively,

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+in mini-course four, negative patterns are

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+also called anti-patterns or bad smells,

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+or bad code smells. So in mini-course four we will see several

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+examples of bad smells and what we can do to eliminate them.