[Razengan]

I like this particular example of how easy it can be to make Swift act like it has language-level concurrency features: https://github.com/beeth0ven/BNQueue/blob/master/BNQueue/BNQ...

Some enum and extension magic easily lets you write things like:

  Queue.UserInitiated.execute {
    let url = NSURL(string: "http://image.jpg")!
    let data = NSData(contentsOfURL: url)!
    let image = UIImage(data: data)

    Queue.Main.execute {
      imageView.image = image
    }
  }

[lobster_johnson]

That's awesome. Blocks were always my favourite part of Ruby, and I think it's really cool that it has been adopted into Swift and (to a lesser extent) Rust.