Functions are first-class values in Scala and can be created using the def keyword. When defining a function, the return type of the parameter must be specified. A function's return type is optional. The default return type of a function is Unit if it is not specified. Function declarations in Scala have the following form: −
def function_name ([list of parameters]) : [return type] =
{
//Statement to be executed
}
When you don't use the equals sign and the method body, methods are implicitly declared abstract.
Example:
object InterviewBit
{
def main(args: Array[String])
{
println("Sum:" + addFunction(10,5));
}
def addFunction(x:Int, y:Int) : Int =
{
var sum:Int = 0
sum = x + y
return sum
}
}
Output:
Sum: 15
