Hello I am pretty new to Functional Programming of...

# functional

[KyooSik Lee]

Hello I am pretty new to Functional Programming of Kotlin.

I am currently using Reactor for my project

It is difficult to work in streams because once the instances of the stream changes it form, I can’t use the instances before change.

ex)
• Flux<AClass> -> Flux<BClass> -> SomeFunction that needs instances of AClass

If above situation happens, I had to find AClass instances again, so the stream would go like

• Flux<AClass> -> Flux<BClass> -> Flux<AClass>

which I think is redundant and DB-work-expensive

So I came up with this Idea to store the value of AClass, and then use it later without getting back.

fun someFunction(something: Foo): Mono<Foo> {
        var zoo: Foo = Foo();

        fooRepository.find()
                .doOnNext { zoo = functionThatReturnsZoo() } // change the value of zoo
                .flatMap { ... }
                .flatMap { fooRepository.save(zoo) } // use zoo
    }