Kotlin withNotNull

example

withNoNulls("hello", "world", Throwable("error")) { p1, p2, p3 ->
    p3.printStackTrace()
    p1.plus(" ").plus(p2)
}?.let {
    Log.d("TAG", it)
} ?: throw Exception("One or more parameters was null")

links

joymyr original post : https://discuss.kotlinlang.org/t/kotlin-null-check-for-multiple-nullable-vars/1946/48

withNotNull.kt

fun <R, A, B> withNotNull(p1: A?, p2: B?, function: (p1: A, p2: B) -> R): R? = p1?.let { p2?.let { function.invoke(p1, p2) } }
fun <R, A, B, C> withNotNull(p1: A?, p2: B?, p3: C?, function: (p1: A, p2: B, p3: C) -> R): R? = p1?.let { p2?.let { p3?.let { function.invoke(p1, p2, p3) } } }
fun <R, A, B, C, D> withNotNull(p1: A?, p2: B?, p3: C?, p4: D?, function: (p1: A, p2: B, p3: C, p4: D) -> R): R? = p1?.let { p2?.let { p3?.let { p4?.let { function.invoke(p1, p2, p3, p4) } } } }
fun <R, A, B, C, D, E> withNotNull(p1: A?, p2: B?, p3: C?, p4: D?, p5: E?, function: (p1: A, p2: B, p3: C, p4: D, p5: E) -> R): R? = p1?.let { p2?.let { p3?.let { p4?.let { p5?.let { function.invoke(p1, p2, p3, p4, p5) } } } } }