fun foo(bar: List<Int>): Int {
    check(bar.isNotEmpty())

    return bar.max()!! / 2
}

How would you deal with

max

returning a nullable value, other than

!!

? Does it bother you?

If

foo

is fine to thrown exception (as I suspect based on the

check

), you can do something like:

fun foo(bar: List<Int>): Int =
        bar
                .max()
                ?.let { it / 2 }
                ?: throw Exception("foo failed")

You can use

error("foo failed")

instead of

throw Exception

I have written

.maxOrThrow()

extension function

^^