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hashmaps

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This commit is contained in:
liruifengv 2022-11-06 17:25:33 +08:00
parent 4f7dc061c6
commit cc412f8756
3 changed files with 20 additions and 17 deletions
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8
exercises/hashmaps/hashmaps1.rs
View File

@ -10,17 +10,15 @@
//
// Execute `rustlings hint hashmaps1` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
use std::collections::HashMap;
fn fruit_basket() -> HashMap<String, u32> {
let mut basket = // TODO: declare your hash map here.
let mut basket = HashMap::new();
// Two bananas are already given for you :)
basket.insert(String::from("banana"), 2);
// TODO: Put more fruits in your basket here.
basket.insert(String::from("apple"), 1);
basket.insert(String::from("orange"), 2);
basket
}

8
exercises/hashmaps/hashmaps2.rs
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@ -11,8 +11,6 @@
//
// Execute `rustlings hint hashmaps2` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
use std::collections::HashMap;
#[derive(Hash, PartialEq, Eq)]
@ -34,9 +32,9 @@ fn fruit_basket(basket: &mut HashMap<Fruit, u32>) {
];
for fruit in fruit_kinds {
// TODO: Put new fruits if not already present. Note that you
// are not allowed to put any type of fruit that's already
// present!
if !basket.contains_key(&fruit) {
basket.insert(fruit, 3);
}
}
}

21
exercises/hashmaps/hashmaps3.rs
View File

@ -14,8 +14,6 @@
// Execute `rustlings hint hashmaps3` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
use std::collections::HashMap;
// A structure to store team name and its goal details.
@ -35,15 +33,24 @@ fn build_scores_table(results: String) -> HashMap<String, Team> {
let team_1_score: u8 = v[2].parse().unwrap();
let team_2_name = v[1].to_string();
let team_2_score: u8 = v[3].parse().unwrap();
// TODO: Populate the scores table with details extracted from the
// current line. Keep in mind that goals scored by team_1
// will be number of goals conceded from team_2, and similarly
// goals scored by team_2 will be the number of goals conceded by
// team_1.
calc_score(&mut scores, team_1_name, team_1_score, team_2_score);
calc_score(&mut scores, team_2_name, team_2_score, team_1_score);
}
scores
}
fn calc_score (scores: &mut HashMap<String, Team>, team_name: String, goals_scored: u8, goals_conceded: u8) {
let mut team = scores.entry(team_name.clone()).or_insert(Team {
name: team_name,
goals_scored: 0,
goals_conceded: 0
});
team.goals_scored += goals_scored;
team.goals_conceded += goals_conceded;
}
#[cfg(test)]
mod tests {
use super::*;