Enumerations

Enums group together a related set of possible values. For things like app status, screen routes, payment state, direction, and theme mode, writing them as an enum is much safer than typing out random strings.

enum AppTheme {
    case light
    case dark
    case system
}

let selectedTheme = AppTheme.dark

switch selectedTheme {
case .light:
    print("Use light colors")
case .dark:
    print("Use dark colors")
case .system:
    print("Follow device setting")
}

AppTheme enum defines three possible app theme options. switch handles every enum case, which cuts down on future bugs.

Use dark colors