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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.