feat: Add hashmap3 exercise.
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exercises/hashmaps/hashmaps3.rs
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88
exercises/hashmaps/hashmaps3.rs
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// hashmaps3.rs
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// A list of scores (one per line) of a soccer match is given. Each line
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// is of the form :
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// <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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// You have to build a scores table containing the name of the team, goals
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// the team scored, and goals the team conceded. One approach to build
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// the scores table is to use a Hashmap. The solution is partially
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// written to use a Hashmap, complete it to pass the test.
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// Make me pass the tests!
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// Execute the command `rustlings hint hashmap3` if you need
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// hints.
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// I AM NOT DONE
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use std::collections::HashMap;
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// A structure to store team name and its goal details.
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struct Team {
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name: String,
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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: String) -> HashMap<String, Team> {
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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<String, Team> = HashMap::new();
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for r in results.lines() {
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let v: Vec<&str> = r.split(',').collect();
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let team_1_name = v[0].to_string();
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let team_1_score: u8 = v[2].parse().unwrap();
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let team_2_name = v[1].to_string();
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let team_2_score: u8 = v[3].parse().unwrap();
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// TODO: Populate the scores table with details extracted from the
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// current line. Keep in mind that goals scored by team_1
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// will be number of goals conceded from team_2, and similarly
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// goals scored by team_2 will be the number of goals conceded by
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// team_1.
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}
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scores
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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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fn get_results() -> String {
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let results = "".to_string()
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+ "England,France,4,2\n"
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+ "France,Italy,3,1\n"
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+ "Poland,Spain,2,0\n"
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+ "Germany,England,2,1\n";
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results
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}
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#[test]
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fn build_scores() {
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let scores = build_scores_table(get_results());
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let mut keys: Vec<&String> = scores.keys().collect();
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keys.sort();
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assert_eq!(
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keys,
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vec!["England", "France", "Germany", "Italy", "Poland", "Spain"]
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);
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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(get_results());
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let team = scores.get("England").unwrap();
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assert_eq!(team.goals_scored, 5);
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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(get_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, 2);
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}
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}
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12
info.toml
12
info.toml
@ -506,6 +506,18 @@ Use the `entry()` and `or_insert()` methods of `HashMap` to achieve this.
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Learn more at https://doc.rust-lang.org/stable/book/ch08-03-hash-maps.html#only-inserting-a-value-if-the-key-has-no-value
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"""
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[[exercises]]
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name = "hashmaps3"
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path = "exercises/hashmaps/hashmaps3.rs"
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mode = "test"
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hint = """
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Hint 1: Use the `entry()` and `or_insert()` methods of `HashMap` to insert entries corresponding to each team in the scores table.
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Learn more at https://doc.rust-lang.org/stable/book/ch08-03-hash-maps.html#only-inserting-a-value-if-the-key-has-no-value
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Hint 2: If there is already an entry for a given key, the value returned by `entry()` can be updated based on the existing value.
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Learn more at https://doc.rust-lang.org/book/ch08-03-hash-maps.html#updating-a-value-based-on-the-old-value
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"""
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# TEST 2
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[[exercises]]
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