Enumeration and Tuples in Swift

Enumerations in Swift

It defines a common type for a group of related values. They provide a type-safe way to work with these values.

Example:

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

Associated Values:

Enum cases can store associated values of any type, allowing them to carry additional data.

Example:

enum Barcode {
    case upc(Int, Int, Int, Int)
    case qrCode(String)
}

var productBarcode = Barcode.upc(8, 85909, 51226, 3)
productBarcode = .qrCode("ABCDEFGHIJKLMNOP")

Raw Values:

Enums can also have raw values of a specific type (e.g., Int, String).

Example:

enum Planet: Int {
    case mercury = 1, venus, earth, mars, jupiter, saturn, uranus, neptune
}

let earthOrder = Planet.earth.rawValue // 3

Tuples in Swift

It allows grouping multiple values into a single compound value. These values can be of different types.

Example:

let http404Error = (404, "Not Found")

let (statusCode, statusMessage) = http404Error // Decomposing
print("The status code is \(statusCode)") // Output: The status code is 404

let namedTuple = (code: 200, message: "OK")
print(namedTuple.message) // Output: OK