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iOS Swift 2.0 Enumerations and Optionals Introduction to Optionals Nil Values in Collections

Need some help with this code

protocol ColorSwitchable { func switchColor (color: Color) }

enum LightState { case On, Off }

enum Color { case RGB(Double, Double, Double, Double) case HSB(Double, Double, Double, Double) }

class WifiLamp { let state: LightState var color: Color

init() { self.state = .On self.color = .RGB(0,0,0,0) } }

optionals.swift
let movieDictionary = ["Spectre": ["cast": ["Daniel Craig", "Christoph Waltz", "Léa Seydoux", "Ralph Fiennes", "Monica Bellucci", "Naomie Harris"]]]

var leadActor: String = ""

// Enter code below