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The concept of bad smells. What are bad smells? Well, we

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mentioned earlier that refactoring is typically applied when there is something

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that does not look right, does not feel right in the

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code. And that's exactly what bad smells are. Bad smells, or

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code smells if you wish, are symptoms in the code of

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a program that might indicate deeper problems. So there might be

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parts of my system, classes in my systems, that just don't

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smell right, and it feels like there's, there might be something wrong

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with them. And if you are an experienced developer just like Brad,

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you'll be able to figure out there is something wrong with the

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classes. You'll be able to smell that there's something wrong and you'll

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do something about it. And I want to mention one more, just to make

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sure that we're all on the same page here. That these bad

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smells are usually not bugs and don't prevent the program from functioning. They

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however indicate weaknesses in the design of the system that might cause

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problems during maintenance. In other words,

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they might make the code less maintainable,

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harder to understand, and so on. Just like refactorings,

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there's also many possible different bad smells. So what

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I'm providing here is just a possible list of

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some very common bad smells. And you can find plenty

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of information on this online. So what I want

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to do next is just to cover before finishing the

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lesson a few of those to show you some

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examples of smells and what you can do about them.