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87 lines
2.7 KiB
Rust
87 lines
2.7 KiB
Rust
// A list of scores (one per line) of a soccer match is given. Each line is of
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// the form "<team_1_name>,<team_2_name>,<team_1_goals>,<team_2_goals>"
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// Example: "England,France,4,2" (England scored 4 goals, France 2).
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//
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// You have to build a scores table containing the name of the team, the total
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// number of goals the team scored, and the total number of goals the team
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// conceded.
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use std::collections::HashMap;
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// A structure to store the goal details of a team.
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#[derive(Default)]
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struct TeamScores {
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goals_scored: u8,
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goals_conceded: u8,
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}
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fn build_scores_table(results: &str) -> HashMap<&str, TeamScores> {
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// The name of the team is the key and its associated struct is the value.
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let mut scores = HashMap::new();
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for line in results.lines() {
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let mut split_iterator = line.split(',');
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// NOTE: We use `unwrap` because we didn't deal with error handling yet.
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let team_1_name = split_iterator.next().unwrap();
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let team_2_name = split_iterator.next().unwrap();
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let team_1_score: u8 = split_iterator.next().unwrap().parse().unwrap();
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let team_2_score: u8 = split_iterator.next().unwrap().parse().unwrap();
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// Insert the default with zeros if a team doesn't exist yet.
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let team_1 = scores
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.entry(team_1_name)
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.or_insert_with(TeamScores::default);
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// Update the values.
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team_1.goals_scored += team_1_score;
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team_1.goals_conceded += team_2_score;
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// Similarly for the second team.
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let team_2 = scores
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.entry(team_2_name)
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.or_insert_with(TeamScores::default);
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team_2.goals_scored += team_2_score;
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team_2.goals_conceded += team_1_score;
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}
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scores
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}
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fn main() {
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// You can optionally experiment here.
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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const RESULTS: &str = "England,France,4,2
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France,Italy,3,1
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Poland,Spain,2,0
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Germany,England,2,1
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England,Spain,1,0";
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#[test]
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fn build_scores() {
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let scores = build_scores_table(RESULTS);
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assert!(["England", "France", "Germany", "Italy", "Poland", "Spain"]
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.into_iter()
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.all(|team_name| scores.contains_key(team_name)));
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}
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#[test]
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fn validate_team_score_1() {
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let scores = build_scores_table(RESULTS);
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let team = scores.get("England").unwrap();
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assert_eq!(team.goals_scored, 6);
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assert_eq!(team.goals_conceded, 4);
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}
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#[test]
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fn validate_team_score_2() {
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let scores = build_scores_table(RESULTS);
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let team = scores.get("Spain").unwrap();
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assert_eq!(team.goals_scored, 0);
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assert_eq!(team.goals_conceded, 3);
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}
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}
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