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You're now in the third part of this course. Things are getting pretty serious as you approach the end. And by now, you've learned so many core concepts in Kotlin. You've learned how to use values and data types in Kotlin. You learned how to branch the execution of your code using expressions like if/else and when statements in combination with logical operators. You also found out what control flow is and how to iterate over a given range using loops. In this part of the course, you met arch-enemy of programming head-on, null. You'll learn how to use nullable types to stop your program from failing in case a value is not present. After that, you'll dive into the concepts of functions. Previously, you used functions which are predefined. Either main or functions, which certain types have like to string on integer or is empty on strings. But now you are ready to create your own custom functions. You'll do this by exploring your syntax, return values, and overloading them to have similar behavior with a slightly different syntax. That's a whole lot of new concepts and you'll see how they are also fun in the next episode.
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