Function Type

fun main(args : Array<String>){
    val sumResult = sum.invoke(10, 10)
    println(sumResult)
    val multiplyResult = multiply.invoke(20, 20)
    println(multiplyResult)
}

typealias Arithmetic = (Int, Int) -> Int

val sum: Arithmetic = { valueA, valueB -> valueA + valueB }
val multiply: Arithmetic = { valueA, valueB -> valueA * valueB }