“Mostly functional” programming does not work

Post by dllthomas » Wed, Apr 30, 2014, 12:03 PM UTC

caughtexception wrote: post #200

dllthomas wrote: post #186

Earlier quoted context omitted.

You asked some questions, I answered them in an attempt to be helpful. Any conclusions you draw about my personal beliefs are spurious and roughly as well founded as your conclusions generally. For what it's worth, I write a bunch of C and I like C very much. I also like Haskell and have to say you really don't know what you're talking about here. I'm not interested in dealing further with these kinds of ramblings, a…

> my personal beliefs Your and the haskell community's puritan behavior . > you really don't know what you're talking about here. Can't Parsec English ? I define the word hypocrisy, from a dictionary no less.

Post by tethis » Wed, Apr 30, 2014, 7:52 PM UTC

muhuk wrote: post #163

tethis wrote: post #50

Earlier quoted context omitted.

And it's important to note with Scala, a big part of its complexity comes from the practical philosophy of its creators: purity is sacrificed in order to actually make it work on the JVM the way we want it to . I used to work with Java on the server-side, but I'm programming almost entirely in Scala now (I'm at a small shop where I was lucky enough to convince the boss to let me give it a go on a project last year) a…

How do you manage nesting from callbacks and matches and such? Inlining short functions like _ + _ is fine, but how do you organize more advanced operations? (I'm just constantly looking for ways to make my scala code more accessible.)

  computation1.flatMap { result1 =>
    computation2.flatMap { result2 =>
      computation3.map { result3 =>
        result2 + result3
      }
    }
  }

  val foobar = for {
    result1 

  val fProject = Project.findById(projectId)
  val fTask = Task.findById(taskId)

  for {
    projectOption  Student.findByProject(projectId)
      case None => Future.successful(IndexedSeq[Student]())
    }

    result  { 
        /* do something with project, task and students */ 
      }
      case (None, _) => Future.successful(NotFound(s"Project $projectId not found"))
      case (_, None) => Future.successful(NotFound(s"Task $taskId not found"))
    }
  }
  yield result