Elvis Operator in Kotlin

ElvisOperator.kt

data class ElvisOperator<T>(
    val condition: Boolean?,
    val trueValue: T?,
) {
    operator fun minus(falseValue: T?): T? =
        if (condition == true) trueValue else falseValue
}
operator fun <T> Boolean?.plus(trueValue: T?) =
    ElvisBuilder(this, trueValue)


fun example() {
    val s = "1"
    var a: String? = null
    var b: String? = null
    (s == "1") + 1 - 2
    (s != "1") + 1 - 2
    (s == "10") + 10 - null
    (s == "1") + a - b
    a = "something"
    b = "anything"
    (s == "1") + a - b
    val resutl: String? = (s == "1") + a - b
}