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 }