The ColorSwitchable protocol needs to have a method requirement as specified in the directions.

Question

In the editor below, I've declared a class, WifiLamp, that represents an interface to one of those Internet of Things lamps. The class models state that determines whether the lamp is on or off and a color, represented by the Color enum.
For the first step, declare a protocol named ColorSwitchable. The protocol has a single requirement: a method named switchColor that takes a value of Color as an argument. For the sake of this challenge, make sure your external argument label is omitted by using an underscore. Give the argument a local name of color.
```protocols.swift
// Declare protocol here
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: ColorSwitchable{
  let state: LightState
  var color: Color
  init() {
    self.state = .On
    self.color = .RGB(0,0,0,0)
  }
  func switchColor (color: Color) {
    self.color = color
  }
}
```

Matthew Connolly · Answer

Hi Napatchol,
Protocol looks great, just a small tweak is needed! The instructions ask you to "... make sure your external argument label is omitted by using an underscore."
swift
protocol ColorSwitchable {
  func switchColor(_ color: Color)
}

More information here (Stack Overflow) (http://stackoverflow.com/a/39627305).

Welcome to the Treehouse Community

Looking to learn something new?

Napatchol Thaipanich

Napatchol Thaipanich

The ColorSwitchable protocol needs to have a method requirement as specified in the directions.

1 Answer

Matthew Connolly

Matthew Connolly

Otto linden

Otto linden