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Time for another module about functions.

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Wait, didn't we already have two modules that talked about functions?

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Well, that will be the last one

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but in this module, we'll dive into some advanced concepts which you need to know about Javascript functions,

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which are definitely not beginner level but which are important.

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Specifically, we'll have a look at pure functions and side effects,

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what that is and why it matters.

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We'll have a look at factory functions, what that is. We'll have a look at closures and therefore revisit this

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concept of scope which we already learned about

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and last but not least, we'll explore a specific way of working with functions,

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we'll have a look at recursion,

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what this is, what it means and when it can be handy.

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So with that, let's not waste any time and dive right in.