Function Basics

Function Basics

A Scala function (or method, when defined inside a class/object) is declared with def name(params): ReturnType = body. When the body is a single expression, the = sign directly assigns its value as the return value, without needing braces or a return keyword. Functions are called by name, just like any built-in operation.

Note: For a single-expression function body, braces are optional: def square(n: Int): Int = n * n is complete on one line.

Example: Function Basics

object Main extends App {
  def greet(): Unit = {
    println("Hello from a function!")
  }

  greet()
  greet()
}