Null Safety Patterns

Elvis Operator

Choose a fallback value with ?:.

Elvis Operator

ElvisOperator.kt 
fun main() {
    val name: String? = 
    val display = name ?: "anonymous"
    val greeting = "hello, $display"

    println("display=$display")
    println(greeting)
}

fun main() {
    val name: String? = 
    val display = name ?: "anonymous"
    val greeting = "hello, $display"

    println("display=$display")
    println(greeting)
}

fun main() {
    val name: String? = 
    val display = name ?: "anonymous"
    val greeting = "hello, $display"

    println("display=$display")
    println(greeting)
}
elvis The Elvis operator keeps a present value or returns the expression on the right.