Function Type With Nullable
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fun main(args : Array<String>){
val sumResult = sum?.invoke(10, 10)
println(sumResult)
//tanpa invoke
val multiplyResult = multiply(20, 20)
println(multiplyResult)
}
//null able
typealias Arithmetic = (Int, Int) -> Int ?
val sum: Arithmetic = { valueA, valueB -> valueA + valueB }
val multiply: Arithmetic = { valueA, valueB -> valueA * valueB }
Kotlin
INFO