To transform the value inside Optional using the inner value’s method we can apply a method reference to map. Map Using The Method of The Inner Value’s Type Val javaNullable: Optional = Optional.ofNullable("Java way, can be null as well”)
The code below shows both approaches: val kotlinNullable: String? = "Kotlin way, this can be null" In Kotlin, there is no additional overhead. Optional usage requires creating a new object for the wrapper every time some value is wrapped or transformed to another type - with the exclusion of when the Optional is empty (singleton empty Optional is used). The code in the examples is written in Kotlin because the language has all the JDK classes available. In this article, I will try to map methods of Java’s Optional to Kotlin’s similar, scattered language features and built-in functions.
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