80 lines
2.3 KiB
Rust
80 lines
2.3 KiB
Rust
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fn likes(names: &[&str]) -> String {
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match names {
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[] => format!("no one likes this"),
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[a] => format!("{} likes this", a),
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[a, b] => format!("{} and {} like this", a, b),
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[a, b, c] => format!("{}, {} and {} like this", a, b, c),
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[a, b, rest @ ..] => format!("{}, {} and {} others like this", a, b, rest.len()),
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}
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}
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#[cfg(test)]
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mod tests {
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use super::likes;
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#[test]
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fn fixed_tests() {
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assert_eq!(likes(&[]), "no one likes this");
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assert_eq!(likes(&["Peter"]), "Peter likes this");
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assert_eq!(likes(&["Jacob", "Alex"]), "Jacob and Alex like this");
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assert_eq!(
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likes(&["Max", "John", "Mark"]),
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"Max, John and Mark like this"
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);
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assert_eq!(
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likes(&["Alex", "Jacob", "Mark", "Max"]),
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"Alex, Jacob and 2 others like this"
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);
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assert_eq!(
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likes(&["a", "b", "c", "d", "e"]),
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"a, b and 3 others like this"
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);
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}
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#[test]
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fn random_tests() {
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use rand::{seq::SliceRandom, thread_rng, Rng};
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let mut rng = thread_rng();
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let mut base = vec![
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"Sylia Stingray",
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"Priscilla S. Asagiri",
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"Linna Yamazaki",
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"Nene Romanova",
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"Nigel",
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"Macky Stingray",
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"Largo",
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"Brian J. Mason",
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"Sylvie",
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"Anri",
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"Leon McNichol",
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"Daley Wong",
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"Galatea",
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"Quincy Rosenkreutz",
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];
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for _ in 0..100 {
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base.shuffle(&mut rng);
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let len = rng.gen_range(0..base.len());
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let names = base.iter().take(len).cloned().collect::<Vec<_>>();
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let actual = likes(&names);
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let expect = likes_solution(&names);
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assert_eq!(actual, expect);
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}
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}
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fn likes_solution(names: &[&str]) -> String {
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let l = names.len();
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match l {
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0 => "no one likes this".to_owned(),
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1 => format!("{} likes this", names[0]),
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2 => format!("{} and {} like this", names[0], names[1]),
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3 => format!("{}, {} and {} like this", names[0], names[1], names[2]),
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_ => format!("{}, {} and {} others like this", names[0], names[1], l - 2),
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}
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}
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}
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