Kotlin for someone who learned in this order: assembler, C++, scheme, C#, Java, JS

• Kategory

  32 5,968 8.8 Kotlin

  Λrrow - Functional companion to Kotlin's Standard Library (by arrow-kt)

  

Yes, Kotlin does not have an option monad, and that is because static nullability is integrated into the language. Having an Option / Optional construct in Kotlin is therefore generally agreed to be superfluous. For example: Λrrow, the state-of-the-art FP framework for Kotlin discontinued their Option monad because it has shown that it is not useful when you already have nullable types. Kotlin offers a lot of features to deal with nullability: safe calls (?.), non-null assertions (!!), the elvis operator (:?) or the fact that nullable types are supertypes of their non-nullable variants. Those are all things you could not achieve with Optional. From my experience, there's always a way to combine the above language features to solve every problem in an elegant matter. So what's the problem with the code in the article? As always it is Java interop. The author coerced this example to fit with his argumentation, but you usually don't use Integer.parseInt() in Kotlin. That one is straight from the Java stdlib. In Kotlin, we have .toInt(), which is an extension function, which means you can utilize safe calls with it:

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