dictionary traverse method

func traverse(keyPath: [String], dict: Dictionary<String, AnyObject>?) -> AnyObject? {
    
    if dict == nil {
        return nil
    }
    
    var paths = keyPath
    
    let next = paths.first!
    
    if paths.count > 1 {
        paths.removeAtIndex(0)
        
        if let nextDict = dict![next] as? Dictionary<String, AnyObject> {
            return traverse(paths, nextDict)
        } else { // fail because bad path
            return nil
        }
        
    } else if paths.count == 1 {
        return dict![next]
    } else {
        println("No PATHS in traverse, returning nil")
        return nil
    }
}