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On cosmetics vs. intrinsics in programming


A ruthless battle happens day by day on the World Vast Internet. Its objective is to determine which programming taste is one of the best: OOP or FP? I assume that crucial and procedural programming should not a part of the contenders.

Arguments vary from the factual to the irrelevant to the totally silly. A few years in the past, I wished to hearken to a video of Martin Odersky (of Scala fame). I bear in mind neither the precise discuss nor the topic. What I bear in mind is the introduction, although: he defined that FP was extra in style than OOP…​ as a result of there have been many extra conferences devoted to the previous than to the latter.

On the time, I didn’t suppose recognition was a related issue that helped me ship tasks. On the time of this writing, I nonetheless don’t. Furthermore, it’s akin to saying that electrical energy isn’t in style as a result of there aren’t any conferences devoted to it. I’m afraid that M. Odersky mistook recognition in educational analysis for relevancy. I finished after his “argument,” and to this present day, I by no means watched a chat of his once more.

This being stated, my level is to not bash M. Odersky however to focus on the sheer vacuity of some arguments. For instance, for FP aficionados, its immutability just isn’t one, as OOP can even make good use of it. The one distinction is that immutability is a requirement in FP. On the alternative aspect, pushing OOP too far leads to languages like Java, the place each methodology should belong to a category, even static ones. On this case, courses are simply an extra namespace for strategies – they convey no OOP “worth”.

The scope goes nicely past OOP vs. FP. Think about the next snippets:

enjoyable router(repo: PersonRepository) = router {
    val handler = Handler(repo)
    GET("/particular person", handler::getAll)
}

class Handler(personal val repo: PersonRepository) {
    enjoyable getAll(r: ServerRequest) =
            okay().physique(repo.findAll())
}

enjoyable router(repo: PersonRepository) = router {
    val handler = Handler(repo)
    GET("/particular person/{id}", handler::getOne)
}

class  Handler(personal val repo: PersonRepository) {
    enjoyable getAll(r: ServerRequest) =
            okay().bodyValue(repo.findAll())
}

Clearly, the distinction lies within the okay().physique() vs. okay().bodyValue(). In case you’re unfamiliar with the Spring framework, you’re unlikely to appropriately establish the left snippet as WebMVC.fn and the precise as Internet Flux. It may be much more complicated if repo.findAll() is up to date from blocking to non-blocking, as you received’t spot any distinction. You’ll be able to solely distinguish one from the opposite by trying on the package deal imports:

  • Blocking: org.springframework.net.servlet.operate.*
  • Non-blocking: org.springframework.net.reactive.operate.server.*

You’ll be able to rewrite each above snippets utilizing annotations as an alternative of handlers.

@RestController
class PersonController(personal val repo: PersonRepository) {

  @GetMapping
  enjoyable getAll() = repo.findAll()
}

@RestController
class PersonController(personal val repo: PersonRepository) {

  @GetMapping
  enjoyable getAll() = repo.findAll()
}

Each snippets seem comparable on the floor, however for the imports. Cosmetics are similar, whereas intrinsics – blocking vs. non-blocking – are essentially totally different.

measureTimeMillis {
    val one = somethingUsefulOne()                             (1)
    val two = somethingUsefulTwo()                             (1)
    runBlocking {
        println("The reply is ${one.await() + two.await()}")
    }
}

1 Operate factors to a suspending computation

Coroutine code cosmetically seems crucial whereas being asynchronous. It’s the benefit of coroutines:

  • It appears to be like crucial on the floor; therefore it’s straightforward sufficient to grasp
  • Behind the scene, the library runs the code asynchronously

Code has beauty and intrinsic traits. I hope the few examples above satisfied you that they’re completely orthogonal. You’ll be able to obtain the identical intrinsics with totally different cosmetics and vice versa.

We consistently argue about cosmetics, e.g., annotations vs. “purposeful”, nevertheless it’s primarily a matter of non-public style. To unravel issues, we have to spend time on intrinsics much more: actors, asynchronous, and so forth.

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