How to idiomatically transform nullable types in Kotlin?

Question

I am new to Kotlin, and I am looking for advises rewriting the following code to more elegant way.

val ts: Long? = 1481710060773

val date: Date?
if (ts != null) {
    date = Date(ts)
}

I have tried let, but I think it is not better than the original one.

val ts: Long? = 1481710060773

val date: Date?
ts?.let {
    date = Date(ts)
}

Thanks.

Answer 1

You can use result of let call like so:

val date = ts?.let(::Date)

You can find more about function references using :: syntax in Kotlin documentation