In null handling between Kotlin and Swift. Transforming all nullable Kotlin values to Optional and vice-versa,Įspecially in such tight areas like Java reflection.įrom my point of view the Optional usage is a fundamental difference I presume it would be pretty challenging to provide a proper compatibility with Java, Kotlin and Java as a stack, where Kotlin is on top. Imagine Objective-C and Swift being connected side-by-side and Unfortunately, it is not really possible to change Kotlin behave the same way.Īpple uses a bridging mechanism to connect Objective-C and Swift binaries, when Kotlin Yourself since I’ve simplified it drastacially at the code sample above.
Swift is open source so you can take a look at Which is extremely similar to a Kotlin sealed class Optional In other words, ? and nil are just syntax sugar literals for Pretty cool, right? The Swift compiler makes all nullable values Optional under the hood. Public static Observable just ( T item ) Let’s take a look at a very short Kotlin + RxJava sample. Otherwise the type system assumes them be to be non-nullable by default.įinally! We can use the JVM and forget about the NullPointerException! When Kotlin objects have to be declared nullable explicitly, Reasonable and pragmatic design decisions - what else to wish for?Īnd, more importantly, it brought the concept of Null SafetyĪll Java objects are essentially implicitly can be null, Well, the JVM probably can be avoided by using Kotlin Native,īut at least on Android you are stuck with the JVM as an intermediate bytecode provider.īacked by a team at JetBrains behind the best IDE platform available, The drug of choice of mine at this point in time is Kotlin,īut you cannot forget about Java when using Kotlin. So let’s ask the “How” question instead of the “Why” one. We live in the world where we just have to deal with null this way or another. However, it does not really matter if the concept of null references a good idea or a really bad one. Null References: The Billion Dollar Mistake talk. I think almost everybody in the CS world knows about the Kotlin: The Problem with null January 10, 2018
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