Functional programming treats functions like first-class citizens. In Scala, this is achieved with syntactic sugar and objects that extend traits (like Function2), but this is how functional programming is achieved in Scala. Also, Scala defines a simple and easy way to define anonymous functions (functions without names). It also supports higher-order functions and it allows nested functions. The syntax of these concepts will be explained in deeper details in the coming chapters.

Also, it helps you to code in an immutable way, and by this, you can easily apply it to parallelism with synchronization and concurrency.