what do you think about two extensions :

fun ifLet(value: Any?, code: ((Any) -> Unit)): Boolean {
    value?.let {
        code.invoke(it)
        return true
    }
    return false
}

fun Boolean.elseLet(code: () -> Unit) {
    if (!this) {
        code.invoke()
    }
}

for use :

ifLet(myMutableValue, {
            System.out.println("Call of ifLet Code myInt value = $it")
        }).elseLet {
            System.out.println("Call of elseLet Code")
        }

?

Honestly, not much. I would prefer the expressiveness of an explicit local

val

and a normal if.