> For the complete documentation index, see [llms.txt](https://george-jen.gitbook.io/data-science-and-apache-spark/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://george-jen.gitbook.io/data-science-and-apache-spark/functions.md).

# Functions

Standard alone, independent, not part of a class

```
(x: Int) => x + 1
val addOne = (x: Int) => x + 1
println(addOne(1)) // 2
val add = (x: Int, y: Int) => x + y
println(add(1, 2)) // 3
```