Enum declaration and cases in Swift - Mini Project: Build & Apply

Enum declaration and cases

📖 Scenario: You are creating a simple app that tracks the weather condition for the day. You want to use an enum to represent different weather types.

🎯 Goal: Build a Swift program that declares an enum called Weather with specific cases, then prints a message based on a selected weather case.

📋 What You'll Learn

Declare an enum named Weather with cases sunny, rainy, and cloudy

Create a variable named todayWeather and assign it the sunny case of Weather

Use a switch statement on todayWeather to print a message for each weather case

Print the message to the console

💡 Why This Matters

🌍 Real World

Enums help represent fixed sets of related values, like weather types, user roles, or app states, making code easier to read and maintain.

💼 Career

Understanding enums is essential for Swift developers building iOS apps, as they are used widely for managing states and options clearly.

1

Declare the enum with weather cases

Declare an enum named Weather with these exact cases: sunny, rainy, and cloudy.

Swift

# Declare the enum Weather with cases sunny, rainy, and cloudy
// Your code here

Need a hint?

Use the enum keyword followed by the name Weather. Inside curly braces, list each case with the case keyword.

2

Create a variable for today's weather

Create a variable named todayWeather and assign it the sunny case of the Weather enum.

Swift

enum Weather {
    case sunny
    case rainy
    case cloudy
}

// Create variable todayWeather and assign it Weather.sunny
// Your code here

Need a hint?

Use var todayWeather = Weather.sunny to create and assign the variable.

3

Use a switch statement to handle weather cases

Write a switch statement on todayWeather with cases .sunny, .rainy, and .cloudy. For each case, assign a message string describing the weather to a variable named message. Use these exact messages: "It's a bright sunny day!", "Don't forget your umbrella.", and "Looks a bit cloudy today." respectively.

Swift

enum Weather {
    case sunny
    case rainy
    case cloudy
}

var todayWeather = Weather.sunny

// Use switch on todayWeather to assign message
// Your code here

Need a hint?

Use switch todayWeather { case .sunny: ... } and assign the exact messages to message.

4

Print the weather message

Write a print statement to display the message variable.

Swift

enum Weather {
    case sunny
    case rainy
    case cloudy
}

var todayWeather = Weather.sunny

var message = ""
switch todayWeather {
case .sunny:
    message = "It's a bright sunny day!"
case .rainy:
    message = "Don't forget your umbrella."
case .cloudy:
    message = "Looks a bit cloudy today."
}

// Print the message
// Your code here

Need a hint?

Use print(message) to show the message on the screen.