koptional | Minimalistic Optional type for Kotlin that tries to fit | Functional Programming library
kandi X-RAY | koptional Summary
kandi X-RAY | koptional Summary
We don't think that Kotlin itself needs Optional because it has strong null-safe type system that effectively eliminates need in such a wrapper. However there are Java APIs and libraries like RxJava 2 and RxJava 3 which don't accept null values and language-level nullability cannot help with that. We also think that in many cases you can use sealed classes to express absent values, however in simple cases like passing String? through RxJava stream Optional is a more convenient solution.
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QUESTION
Like in this example:
...ANSWER
Answered 2018-Oct-29 at 16:43I agree with @zsmb13's comment. Using Nothing
in a generic type hierarchy is perfectly valid and even gives benefits over other options:
First,
Nothing
is embedded in the Kotlin type system as a subtype of any other type, so it plays well with generics variance. For example,Option
can be passed whereOption
is expected.Second, the compiler will perform control flow checks and detect unreachable code after a
Nothing
-returning member call when the type is statically known.
QUESTION
I have a huge project with databinding, kotlin, dagger. I spent a few days trying to build it using several stackoverflow's solutions and decided to ask it personally.
I assume some of third party libraries uses databinding because adding this line doesn't help.
...ANSWER
Answered 2017-Nov-19 at 12:00Just remove the Kotlin library. Android Stidio 3.0 supports it by default.
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