Scala Functions

Functions are group of statements that perform a task. Scala functions do look a lot like variables. The following code shows how a function can be declared.

A simple example of a function in Scala

def add(a:Int,b:Int):Int=a+b

Within the parenthesis lies the arguments followed by the argument type, after the parenthesis the return type and after the equal to "=" lies the logic of our function. The above code can also be written as below.

def add(a:Int, b:Int):Int={
  println(a+b)
}

def sum(a:Int, b:Int):Int={
  a+b
}

 println(sum(10,20))
 add(20,30)

Points to note

1. Scala Functions start with a def keyword
2. Scala permits nested function definitions
3. Braces {} are optional. For clarity purposes once can enclose multi statement functions in braces.
4. return statement is optional
5. A Function that doesn't return any value can return Unit, equivalent to void in other languages.