Swift Academy · Lesson

Raw Values and CaseIterable

Q: Is the “Raw Values and CaseIterable” lesson free?

Yes — any 3 lessons of the Swift Academy learning path, including “Raw Values and CaseIterable”, are free to read in full here on the web. After that, CoddyKit PRO unlocks every lesson, plus interactive practice with a built-in code editor and a 24/7 AI tutor. The Swift Academy course includes 4 lessons in total.

Q: Do I need any experience to start Swift Academy?

No prior experience is required. Swift Academy on CoddyKit is structured for beginners through advanced learners, so you can start here or from the beginning and move at your own pace. This is lesson 1 of 4.

Q: How long does the “Raw Values and CaseIterable” lesson take?

Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.

Q: Can I write and run code in this Swift Academy lesson?

Yes. Every Swift Academy lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.

Enums backed by String, Int or other RawRepresentable types plus allCases.

Lesson 1 of 412 steps

Raw Values and CaseIterable is a free Swift Academy lesson on CoddyKit. This is lesson 1 of 4. Any 3 lessons of this learning path are free to read in full — after that, CoddyKit PRO unlocks every lesson, plus hands-on practice with a built-in code editor and a 24/7 AI tutor. It is part of the Swift Academy learning path, and your progress syncs across the web and the CoddyKit app. The Swift Academy course includes 4 lessons in total.

Welcome

Swift enums can have *raw values* — literal values stored with each case. Conforming to `CaseIterable` gives you a collection of all cases automatically.

Raw Value Enums

```swift enum Direction: String { case north = "N" case south = "S" case east = "E" case west = "W" } print(Direction.north.rawValue) // "N" ```

Auto-Incrementing Int Raw Values

```swift enum Planet: Int { case mercury = 1 case venus // 2 (auto) case earth // 3 case mars // 4 } print(Planet.earth.rawValue) // 3 ```

String Raw Values Auto-Named

```swift enum Color: String { case red, green, blue } print(Color.blue.rawValue) // "blue" — auto-named ``` With String raw values, if you omit the assignment, the raw value equals the case name.

init?(rawValue:) — Failable

```swift if let dir = Direction(rawValue: "N") { print(dir) // Direction.north } let invalid = Direction(rawValue: "X") // nil ``` The auto-generated failable init returns nil for unrecognised raw values.

CaseIterable

```swift enum Season: CaseIterable { case spring, summer, autumn, winter } print(Season.allCases) // [.spring,.summer,.autumn,.winter] print(Season.allCases.count) // 4 ```

Iterating All Cases

```swift for season in Season.allCases { print(season) } let picker = Season.allCases.map { "\($0)".capitalized } ```

CaseIterable with Raw Values

```swift enum Suit: String, CaseIterable { case hearts="♥", diamonds="♦", clubs="♣", spades="♠" } print(Suit.allCases.map { $0.rawValue }) // ["♥","♦","♣","♠"] ```

Raw Values for Codable

String raw value enums work seamlessly with `Codable`: ```swift enum Status: String, Codable { case active, inactive, pending } struct User: Codable { var status: Status } // JSON "active" decodes to .active automatically ```

Raw Values for Flag Bitmasks

```swift struct Permission: OptionSet { let rawValue: Int static let read = Permission(rawValue: 1 << 0) static let write = Permission(rawValue: 1 << 1) static let execute = Permission(rawValue: 1 << 2) } var p: Permission = [.read, .write] print(p.contains(.read)) // true ```

Quick Check

What protocol makes all enum cases accessible via `allCases`?

Answer it in the interactive lesson

Recap

Key takeaways: • Raw values: `enum E: String { case a = "x" }` • Int raw values auto-increment; String raw values default to case name • `init?(rawValue:)` is auto-generated and failable • `CaseIterable` provides `.allCases` static property • Combine: `String, CaseIterable` for menus and pickers Next: associated values.

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Frequently Asked Questions

Is the “Raw Values and CaseIterable” lesson free?

Yes — any 3 lessons of the Swift Academy learning path, including “Raw Values and CaseIterable”, are free to read in full here on the web. After that, CoddyKit PRO unlocks every lesson, plus interactive practice with a built-in code editor and a 24/7 AI tutor. The Swift Academy course includes 4 lessons in total.

What will I learn in “Raw Values and CaseIterable”?

Enums backed by String, Int or other RawRepresentable types plus allCases. You practise Swift Academy with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.

Do I need any experience to start Swift Academy?

No prior experience is required. Swift Academy on CoddyKit is structured for beginners through advanced learners, so you can start here or from the beginning and move at your own pace. This is lesson 1 of 4.

How long does the “Raw Values and CaseIterable” lesson take?

Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.

Can I write and run code in this Swift Academy lesson?

Yes. Every Swift Academy lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.

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