Iterating enum cases with CaseIterable in Swift - Mini Project: Build & Apply

Iterating enum cases with CaseIterable

📖 Scenario: You are creating a simple app that shows different fruit options to users. You want to list all the fruits you support in your app.

🎯 Goal: Build a Swift program that defines an enum of fruits and uses CaseIterable to list all fruit cases.

📋 What You'll Learn

Create an enum called Fruit with cases apple, banana, and cherry

Make the Fruit enum conform to CaseIterable

Create a variable called allFruits that holds all cases of Fruit

Use a for loop with variable fruit to iterate over allFruits

Print each fruit case inside the loop

💡 Why This Matters

🌍 Real World

Enums with CaseIterable are useful when you want to list all options of a category, like fruit types, app themes, or user roles.

💼 Career

Understanding how to iterate enum cases helps in building clean, maintainable code for apps that need to handle fixed sets of options.

1

Create the Fruit enum with cases

Create an enum called Fruit with cases apple, banana, and cherry.

Swift

# Create the Fruit enum with cases apple, banana, and cherry
# Your code here

Need a hint?

Use enum Fruit { case apple, banana, cherry } or write each case on its own line.

2

Make Fruit conform to CaseIterable

Make the Fruit enum conform to CaseIterable by adding it after the enum name.

Swift

enum Fruit: CaseIterable {
    case apple
    case banana
    case cherry
}
# Your code here

Need a hint?

Add : CaseIterable right after Fruit in the enum declaration.

3

Create allFruits variable with all cases

Create a variable called allFruits and set it to Fruit.allCases to get all enum cases.

Swift

enum Fruit: CaseIterable {
    case apple
    case banana
    case cherry
}

var allFruits = Fruit.allCases
# Your code here

Need a hint?

Use var allFruits = Fruit.allCases to get all cases.

4

Print all fruit cases using a for loop

Use a for loop with variable fruit to iterate over allFruits and print each fruit.

Swift

enum Fruit: CaseIterable {
    case apple
    case banana
    case cherry
}

var allFruits = Fruit.allCases

for fruit in allFruits {
    // Your code here
}

Need a hint?

Use print(fruit) inside the loop to show each fruit.