enums.swift

// User defined type

// Restricted to finite set of related or like values

// Safe and clean

// Compile time check

// Expressing algorithms naturally

// Monday, Tuesday, Wednesday...

// Instead of 1, 2, 3...

enum Color {
    case red, green, blue
}

let color:Color = .red


if color == .red {
    print("Color is red")
} else {
    print("Color is not red")
}

switch color {
case .red:
    print("Color is red")
case .green:
    print("Color is green")
case .blue:
    print("Color is blue")
}

// Powerful and flexible

// Can do most everything structure can do

// No values assign by default

// By decorating enum name you can associate raw values

// Can be all numeric types, string and char


//enum Level: Int {
//    case low = 1
//    case medium = 2
//    case high = 3
//}

enum Level: Int {
    case low = 1
    case medium
    case high // 3
}

let currentLevel: Level = .low

currentLevel.rawValue

enum Result {
  case success(value: Int)
  case error(message: String)
}

let result: Result = .success(value: 100)

switch result {
case .success(let newValue):
    print("New value is \(newValue)")
case .error(let error):
    print(error)
}


enum Day {
    case sunday, monday, tuesday, wednesday, thursday, friday, saturday
    func isWeekday() -> Bool {
        switch self {
        case .saturday, .sunday:
            return false
        default:
            return true
        }
    }
}

let day: Day = .monday

if day.isWeekday() {
    print("Workweek")
} else {
    print("Weekend")
}