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Complete hashmaps exercises

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This commit is contained in:
Robert Zhao 2023-06-09 19:24:17 -04:00
parent a6a9c0e30d
commit 65d5fdf7d1
3 changed files with 35 additions and 14 deletions
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7
exercises/hashmaps/hashmaps1.rs
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@ -10,17 +10,16 @@
// //
// Execute `rustlings hint hashmaps1` or use the `hint` watch subcommand for a hint. // Execute `rustlings hint hashmaps1` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
use std::collections::HashMap; use std::collections::HashMap;
fn fruit_basket() -> HashMap<String, u32> { 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 :) // Two bananas are already given for you :)
basket.insert(String::from("banana"), 2); basket.insert(String::from("banana"), 2);
// TODO: Put more fruits in your basket here. basket.insert(String::from("cherry"), 2);
basket.insert(String::from("dragonfruit"), 2);
basket basket
} }

13
exercises/hashmaps/hashmaps2.rs
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@ -13,8 +13,6 @@
// //
// Execute `rustlings hint hashmaps2` or use the `hint` watch subcommand for a hint. // Execute `rustlings hint hashmaps2` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
use std::collections::HashMap; use std::collections::HashMap;
#[derive(Hash, PartialEq, Eq)] #[derive(Hash, PartialEq, Eq)]
@ -36,9 +34,18 @@ fn fruit_basket(basket: &mut HashMap<Fruit, u32>) {
]; ];
for fruit in fruit_kinds { for fruit in fruit_kinds {
// TODO: Insert new fruits if they are not already present in the basket.
// Note that you are not allowed to put any type of fruit that's already // Note that you are not allowed to put any type of fruit that's already
// present! // present!
basket.entry(fruit).or_insert(2);
// Bad way
// match basket.get(&fruit) {
// None => {
// basket.insert(fruit, 2);
// }
// _ => {}
// };
} }
} }

29
exercises/hashmaps/hashmaps3.rs
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@ -14,8 +14,6 @@
// Execute `rustlings hint hashmaps3` or use the `hint` watch subcommand for a hint. // Execute `rustlings hint hashmaps3` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
use std::collections::HashMap; use std::collections::HashMap;
// A structure to store team name and its goal details. // A structure to store team name and its goal details.
@ -35,11 +33,28 @@ fn build_scores_table(results: String) -> HashMap<String, Team> {
let team_1_score: u8 = v[2].parse().unwrap(); let team_1_score: u8 = v[2].parse().unwrap();
let team_2_name = v[1].to_string(); let team_2_name = v[1].to_string();
let team_2_score: u8 = v[3].parse().unwrap(); 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 let team_1 = scores.entry(team_1_name.clone()).or_insert(Team {
// will be the number of goals conceded from team_2, and similarly name: team_1_name.clone(),
// goals scored by team_2 will be the number of goals conceded by goals_scored: 0,
// team_1. goals_conceded: 0,
});
*team_1 = Team {
name: team_1_name.clone(),
goals_scored: team_1.goals_scored + team_1_score,
goals_conceded: team_1.goals_conceded + team_2_score,
};
let team_2 = scores.entry(team_2_name.clone()).or_insert(Team {
name: team_2_name.clone(),
goals_scored: 0,
goals_conceded: 0,
});
*team_2 = Team {
name: team_2_name.clone(),
goals_scored: team_2.goals_scored + team_2_score,
goals_conceded: team_2.goals_conceded + team_1_score,
};
} }
scores scores
} }