/*
* A long, fairly convoluted example of the elvis operator
* an null safety in kotlin
*
* @author gtowell
* Created: October 2021
 */
fun main() {
    val aaa : String
    //println(aaa)
    val bbb: String? = null
    println(getLength(bbb))
    println(getLength("aaa"))
    println(getLength1(bbb))
    println(getLength1("aaa"))
    println(getLength3("bbbbbb"))
    println(getLength3(null))
    println(getLength4("12345678"))
    println(getLength4(null))

    //println(getLength5(null))   // will not compile

}



fun getLength(vv:String?):Int? {
    return vv?.length
}

fun getLength1(vv:String?):Int? {
    return (vv ?: "aaaaa").length
}

fun getLength3(vv:String?) = vv?.length

fun getLength4(vv:String?) = if (vv!=null) { vv.length } else { null }

fun getLength5(vv:String) =  vv.length 

// fun getLength6(vv:String?) =  vv.length // will not compile