Syntax differences

prepareForSegue.swift

// this...

override func prepareForSegue(segue: UIStoryboardSegue!, sender: AnyObject!) {
        let group = data?[self.tableView.indexPathForSelectedRow().row]
        if let destination = segue.destinationViewController as? ViewController {
            destination.title = group?.valueForProperty(ALAssetsGroupPropertyName) as? NSString
            destination.data = PhotoManager.lazySendableForGroup(manager) <^> group
        } else {
            println("Cast failed, proposed class of segue view controller is wrong")
        }
    }
    
    
// or this?

override func prepareForSegue(segue: UIStoryboardSegue!, sender: AnyObject!) {
        let blockManager = self.manager
        (data?[self.tableView.indexPathForSelectedRow().row] >>= {
            (group:ALAssetsGroup) -> ()? in
            (segue.destinationViewController as? ViewController >>= {
                (destination:ViewController) -> ()? in
                destination.title = group.valueForProperty(ALAssetsGroupPropertyName) as? NSString
                destination.data = blockManager.lazySendableForGroup(group)
                return ()
                }) ?? println("ViewController cast failed")
            }) ?? println("Data array was None")
    }