Scala and Spark for Big Data Analytics

The return in Scala

Before learning how a Scala method returns a value, let's recap the structure of a method in Scala:

def functionName ([list of parameters]) : [return type] = {  function body  value_to_return}

For the preceding syntax, the return type could be any valid Scala data type and a list of parameters will be a list of variables separated by a comma and a list of parameters and return type is optional. Now, let's define a method that adds two positive integers and returns the result, which is also an integer value:

scala> def addInt( x:Int, y:Int ) : Int = {     |       var sum:Int = 0     |       sum = x + y     |       sum     |    }addInt: (x: Int, y: Int)Intscala> addInt(20, 34)res3: Int = 54scala>

If you now call the preceding method from the main() method with ...