inline fun <reified T: Any?> String.get(columnIndex: Int): T {
    TODO()
}

inline fun <reified T: Any> String.get(columnIndex: Int): T {
    TODO()
}

Map

getValue

null

T?

T

@Test
    fun foo() {
        val x: String = "foo".zzz()
        val y: String? = "foo".zzz()

        println(x)
        println(y)
    }

    inline fun <reified T> String.zzz(): T {
        return "hello" as T
    }

    inline fun <reified T> String.zzz(dummy: Int = 3): T? {
        return null
    }

T

T?

val a: String? = "whatever"

x?.y?.z

let(x, X::getY, Y::getZ)