Rust by Example

match

Rust provides pattern matching via the match keyword, which can be used like a C switch. The first matching arm is evaluated and all possible values must be covered.

fn main() {

let number = 13;

// TODO ^ Try different values for `number`

println!("Tell me about {}", number);

match number {

// Match a single value

1 => println!("One!"),

// Match several values

2 | 3 | 5 | 7 | 11 => println!("This is a prime"),

// TODO ^ Try adding 13 to the list of prime values

// Match an inclusive range

13..=19 => println!("A teen"),

// Handle the rest of cases

_ => println!("Ain't special"),

// TODO ^ Try commenting out this catch-all arm

}

let boolean = true;

// Match is an expression too

let binary = match boolean {

// The arms of a match must cover all the possible values

false => 0,

true => 1,

// TODO ^ Try commenting out one of these arms

};

println!("{} -> {}", boolean, binary);

}

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