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func buildDidCompleteCallback(callback: Callback?) -> (data: NSData?, response: NSURLResponse?, error: NSError?) {
        
}

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Thoughts on Swift 2 Errors

When Swift was first announced, I was gratified to see that one of the (few) philosophies that it shared with Objective-C was that exceptions should not be used for control flow, only for highlighting fatal programming errors at development time.

So it came as a surprise to me when Swift 2 brought (What appeared to be) traditional exception handling to the language.

Similarly surprised were the functional Swift programmers, who had put their faith in the Haskell-style approach to error handling, where every function returns an enum (or monad, if you like) containing either a valid result or an error. This seemed like a natural fit for Swift, so why did Apple instead opt for a solution originally designed for clumsy imperative languages?

I'm going to cover three things in this post:

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The introduction to Reactive Programming you've been missing

(by @andrestaltz)

---

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

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let predicate = NSPredicate(format: "done == %@", NSNumber(bool: true))
let tasks = realm.objects(TDTask).filter(predicate).sorted("created",ascending:false)

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let predicate = NSPredicate(format: "done == %@", NSNumber(bool: true))
let tasks = realm.objects(TDTask).filter(predicate)

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let predicate = NSPredicate(format: "done == %@", NSNumber(bool: true))
let tasks = realm.objects(TDTask).filter(predicate)

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let realm = try! Realm()
realm.beginWrite()
task.title = titleTextField.text!
task.taskDescription = descriptionTextView.text
if statusSwitch.on {
  task.done = true
} else {
  task.done = false
}
try! realm.commitWrite()

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let tasks = realm.objects

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let task = TDTask()
task.title = titleTextField.text!
task.taskDescription = descriptionTextView.text
let realm = try! Realm()
realm.beginWrite()
realm.add(task)
try! realm.commitWrite()

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import RealmSwift

class TDTask: Object {
  dynamic var title: String = ""
  dynamic var taskDescription: String = ""
  dynamic var done: Bool = false
  dynamic var created: NSTimeInterval = NSDate().timeIntervalSince1970
}