Basic match usage in Rust - Mini Project: Build & Apply

Basic match usage

📖 Scenario: Imagine you are building a simple program that checks the weather condition and gives a message based on it.

🎯 Goal: You will create a variable for the weather condition, then use a match statement to print a message depending on the weather.

📋 What You'll Learn

Create a variable called weather with the exact value "sunny".

Create a variable called temperature with the exact value 25.

Use a match statement on the weather variable with arms for "sunny", "rainy", and a catch-all _.

Print the message for the matched weather condition.

💡 Why This Matters

🌍 Real World

Using <code>match</code> is common in Rust programs to handle different cases clearly and safely, like responding to user input or different program states.

💼 Career

Understanding <code>match</code> helps you write clear and bug-free Rust code, a skill valued in systems programming, embedded devices, and backend development.

1

Create the weather and temperature variables

Create a variable called weather and set it to the string "sunny". Also create a variable called temperature and set it to the number 25.

Rust

# Create the variables 'weather' and 'temperature'
# Your code here

Need a hint?

Use let to create variables. Strings use double quotes.

2

Add a match statement for weather

Add a match statement on the variable weather. Create arms for "sunny", "rainy", and a catch-all arm _. For now, just write empty blocks {} for each arm.

Rust

fn main() {
    let weather = "sunny";
    let temperature = 25;

    match weather {
        "sunny" => {},
        "rainy" => {},
        _ => {},
    }
    # Your code here
}

Need a hint?

Use match weather { ... } with arms separated by commas.

3

Add messages inside match arms

Inside the match arms, add println! statements to print these exact messages:
For "sunny": "It's a bright sunny day!"
For "rainy": "Don't forget your umbrella."
For the catch-all _: "Weather unknown."

Rust

fn main() {
    let weather = "sunny";
    let temperature = 25;

    match weather {
        "sunny" => {
            // Print sunny message
        },
        "rainy" => {
            // Print rainy message
        },
        _ => {
            // Print unknown message
        },
    }
    # Your code here
}

Need a hint?

Use println!("message") inside each arm's block.

4

Print the temperature after the match

After the match statement, add a println! statement to print the temperature in this exact format: "The temperature is 25 degrees." Use the variable temperature inside the message with an f-string style placeholder.

Rust

fn main() {
    let weather = "sunny";
    let temperature = 25;

    match weather {
        "sunny" => {
            println!("It's a bright sunny day!");
        },
        "rainy" => {
            println!("Don't forget your umbrella.");
        },
        _ => {
            println!("Weather unknown.");
        },
    }

    // Print the temperature here
    # Your code here
}

Need a hint?

Use println!("The temperature is {} degrees.", temperature); to print the temperature.