hashmaps done but didn't understand hashmap3.rs🦀

exercises/hashmaps/hashmaps1.rs

@@ -10,15 +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);
+    basket.insert(String::from("apple"), 0);
+    basket.insert(String::from("mango"), 3);
 
     // TODO: Put more fruits in your basket here.
 

exercises/hashmaps/hashmaps2.rs

@@ -13,8 +13,6 @@
 //
 // 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)]
@@ -39,6 +37,7 @@ fn fruit_basket(basket: &mut HashMap<Fruit, u32>) {
         // 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
         // present!
+        basket.entry(fruit).or_insert(1);
     }
 }
 

exercises/hashmaps/hashmaps3.rs

@@ -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.
@@ -40,6 +38,28 @@ fn build_scores_table(results: String) -> HashMap<String, Team> {
         // will be the number of goals conceded from team_2, and similarly
         // goals scored by team_2 will be the number of goals conceded by
         // team_1.
+        scores
+            .entry(team_1_name)
+            .and_modify(|t| {
+                t.goals_scored += team_1_score;
+                t.goals_conceded += team_2_score;
+            })
+            .or_insert_with_key(|team_name| Team {
+                name: team_name.to_string(),
+                goals_scored: team_1_score,
+                goals_conceded: team_2_score,
+            });
+        scores
+            .entry(team_2_name)
+            .and_modify(|t| {
+                t.goals_scored += team_2_score;
+                t.goals_conceded += team_1_score;
+            })
+            .or_insert_with_key(|team_name| Team {
+                name: team_name.to_string(),
+                goals_scored: team_2_score,
+                goals_conceded: team_1_score,
+            });
     }
     scores
 }