![]() So far we have not talked about the interoperability with Java. ![]() We have to do before returning an object (and simply return null if it is null) then The most common reason to use apply is the initialisation of an object. ![]() For example letʼs suppose we have a class Greeter which has a function hello thatīy default prints a greeting message on the standard output:Ĭlass Greeter In Kotlin when you declare a variable, a field or a function parameter, by default they cannotīe null. This problem is to use some kind of Option monad.Īs weʼll soon see Kotlin actually does not introduce any new special wrapper type - it uses regular Java It is quite interesting - especially at times like these when the most popular way of handling One of the first features a Kotlin developer learns is the languageʼs approach to handling null values. Shiny server-side system using Kotlin as its primary language and we do not regret it. Therefore at Allegro we decided to give it a chance - we built our new Its history however dates a few years backĪnd itʼs mature and stable enough to be used for developing solid reliable applications. Kotlin may seem like a new kid on the block - itʼs been officially released only in February.
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