CODEWITHSUNDEEP
kotlin
iForests
iForests

Reputation: 6949

How to idiomatically transform nullable types in Kotlin?

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.

Upvotes: 6

Views: 458

Answers (2)

miensol
miensol

Reputation: 41638

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

Upvotes: 5

Lukas Lechner
Lukas Lechner

Reputation: 8191

val ts = 1481710060773L
val date = Date(ts)

You don't need to specify ts as a nullable long type Long? if you are assigning a constant value to it. Then the type Long is inferred to ts and no null-check is necessary anymore.

Upvotes: -1

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