Kotlin Tutorial #5: Functions, Default Parameters, and Named Arguments

In the previous tutorial, you learned about null safety. Now let’s learn about functions — the building blocks that organize your code into reusable pieces. Watch the Video: Prefer watching? Check out the video version of this tutorial on YouTube. Kotlin functions are more powerful than Java methods. They support default parameters, named arguments, single-expression syntax, and much more. In this tutorial, you will learn: Regular functions Single-expression functions Default parameters (no more method overloading) Named arguments Varargs Local functions Higher-order functions Extension functions Infix functions Regular Functions A function in Kotlin starts with the fun keyword: ...

March 19, 2026 · 8 min