toUIntOrNull
Parses the string as an UInt number and returns the result or null if the string is not a valid representation of a number.
fun String.toUIntOrNull(): UInt?(source)
fun main() {
val valid = "42".toUIntOrNull()
val invalid = "not_a_number".toUIntOrNull()
println(valid) // 42
println(invalid) // null
}