safe_call.kt

fun main() {
    var name: String? = "joey"

    if (name != null) {
        val nameLength = name.length
    }
    

    // The same thing can be done in a much shorter way:
    var nameLength = name?.length // nameLength = 4
    

    name = null
    nameLength = name?.length // nameLength = null
    

    // Since name?.substring(0, 2) can produce a null value,
    // you have to call toUpperCase() with a safe call operator too:
    val newName = name?.substring(0, 2)?.toUpperCase()
    
    
    // A function does not have to have a return value to be able
    // to be called with the safe call operator:
    something?.someFunction()
}