Enums

Enums

Enums define a type with a fixed set of cases:

enum Direction {
    case north
    case south
    case east
    case west
}

let dir = Direction.north

Raw Values

Enums can have raw values of any type:

enum Planet: String {
    case mercury = "Mercury"
    case venus   = "Venus"
    case earth   = "Earth"
}

print(Planet.earth.rawValue)  // Earth

Switching on Enums

switch dir {
case .north:
    print("Going north")
case .south:
    print("Going south")
default:
    print("Going elsewhere")
}

Your Task

Define an enum Planet with String raw values for mercury, venus, earth, mars. Then write a function describe that takes a Planet and returns a string like "Earth is a planet.".