transport to the airport?? ugh

the original Gang of Four book is one of the most important of all time, even though the examples are in C++, still a great book…

@codeslubber sourcemaking.com generally has decent content. I didn’t spend very long looking for the best example, just a link to explain the pattern generally

yeah not complaining to you! sorry.. I love DPs and just think most the time they are done badly.. that’s all

How is it possible to write a

provideDelegate

as an extension function? there is no examples of how to accomplish this in the documentation

better example would be something like BMIComputer, where there are different ways to compute a value.. the ground transport is not really a strategy it’s a type problem… 4 replies The book by vascaran sarcar "java design pattern". That book reference to gang of four

can I implement an interface method definition with an extension? Getting an error… “shadowing”

or even better make the extension somehow implement the interface

(that would require the extension to be at class level, don’t know if something like that is possible)

What I want to do: have a series of classes implement an interface without modifying the code of the classes

i.e. using extensions

hmm https://discuss.kotlinlang.org/t/extensions-function-to-implement-interface/411

Isn't possible at this moment

Extensions are not members, so no.

ok… 😞

Use compositing and delegation to implement it.

compositing and delegating how exactly?

Has anyone tried using Kotlin with React Native?

like wrap the objects in something else that implements the interface?

@iex yes, exactly.

@miha-x64 thanks

what’s the preferred way currently to implement an “either” type? I found this https://discuss.kotlinlang.org/t/disjoint-unions-in-kotlin/413

not sure it’s up to date

is it worth using this lib for that https://github.com/MarioAriasC/funKTionale

problem, in case anyone wonders why I need this, I’m using RxJava2 and have to return a “null” from an observable, but it isn’t allowed, I have to return something like

Object()

instead, so I thought about using an “either” type to not lose the type safety of the observable

You can try using Optional too (not that one which provided by Java 8).

which then?

not sure what you mean with “not that one which provided by Java 8”. I’m using Android which supports only a small subset of Java 8…