Switch must be exhaustive in Swift - Mini Project: Build & Apply

Switch Must Be Exhaustive

📖 Scenario: Imagine you are building a simple app that shows different messages based on the weather condition. You want to use a switch statement to handle all possible weather types.

🎯 Goal: Create a switch statement in Swift that covers all cases of a weather enum without missing any. This will teach you how to make your switch statements exhaustive, so your program handles every possible case safely.

📋 What You'll Learn

Create an enum called Weather with cases sunny, rainy, and cloudy

Create a variable called today and set it to Weather.sunny

Write a switch statement on today that handles all cases of Weather

Print a different message for each weather case

💡 Why This Matters

🌍 Real World

Handling all possible cases in a switch statement helps avoid bugs and crashes in apps that depend on different states or types.

💼 Career

Many programming jobs require writing safe and complete switch statements, especially when working with enums or similar types.

1

Create the Weather enum

Create an enum called Weather with these exact cases: sunny, rainy, and cloudy.

Swift

# Your code here

Need a hint?

Use the enum keyword to define Weather and list all cases exactly.

2

Create the today variable

Create a variable called today and set it to Weather.sunny.

Swift

enum Weather {
    case sunny
    case rainy
    case cloudy
}

# Your code here

Need a hint?

Use var today = Weather.sunny to create the variable.

3

Write the exhaustive switch statement

Write a switch statement on today that handles all cases: sunny, rainy, and cloudy. For each case, assign a message string describing the weather to a variable called message.

Swift

enum Weather {
    case sunny
    case rainy
    case cloudy
}

var today = Weather.sunny

# Your code here

Need a hint?

Use switch today { case .sunny: ... case .rainy: ... case .cloudy: ... } and assign messages to message.

4

Print the message

Write a print statement to display the message variable.

Swift

enum Weather {
    case sunny
    case rainy
    case cloudy
}

var today = Weather.sunny

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

# Your code here

Need a hint?

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