Twelve Days of Christmas implementation in Rust.

main-tuples.rs

fn main() {
    let gifts = [
        ("First", "a Partridge in a Pear Tree"),
        ("Second", "Two Turtle Doves"),
        ("Third", "Three French Hens"),
        ("Fourth", "Four Calling Birds"),
        ("Fifth", "Five Gold Rings"),
        ("Sixth", "Six Geese a-Laying"),
        ("Seventh", "Seven Swans a-Swimming"),
        ("Eighth", "Eight Maids a-Milking"),
        ("Nineth", "Nine Ladies Dancing"),
        ("Tenth", "Ten Lords a-Leaping"),
        ("Eleventh", "Eleven Pipers Piping"),
        ("Twelfth", "Twelve Drummers Drumming"),
    ];
    for (day, (ordinal, _)) in gifts.iter().enumerate() {
        println!("On the {} day of Christmas my true love sent to me", &ordinal);
        for (_, (_, verse)) in gifts[1..day + 1].iter().rev().enumerate() {
            println!("{},", verse);
        }
        println!("{}{}.\n", if day >= 1 {"and "} else {""}, gifts[0].1);
    }
}

main.rs

fn main() {
    let gifts = [
        "a Partridge in a Pear Tree",
        "Two Turtle Doves",
        "Three French Hens",
        "Four Calling Birds",
        "Five Gold Rings",
        "Six Geese a-Laying",
        "Seven Swans a-Swimming",
        "Eight Maids a-Milking",
        "Nine Ladies Dancing",
        "Ten Lords a-Leaping",
        "Eleven Pipers Piping",
        "Twelve Drummers Drumming",
    ];
    let days = [
        "First",
        "Second",
        "Third",
        "Fourth",
        "Fifth",
        "Sixth",
        "Seventh",
        "Eighth",
        "Nineth",
        "Tenth",
        "Eleventh",
        "Twelfth"
    ];
    for (day, &ordinal) in days.iter().enumerate() {
        println!("On the {} day of Christmas my true love sent to me", &ordinal);
        for (_, &verse) in gifts[1..day + 1].iter().rev().enumerate() {
            println!("{},", verse);
        }
        println!("{}{}.\n", if day >= 1 {"and "} else {""}, gifts[0]);
    }
}