quizzes

practice/src/bin/f_largest_by_key.rs

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+// Напиúите обобûённуĀ функøиĀ largest_by_key<T, F, K>(list: &[T], key: F) -> Option<&T>, где:
+// ● F: Fn(&T) -> K,
+// ● K: PartialOrd.
+// Функøиā должна возвраûатþ ÿлемент с максималþнýм знаùением key(item).
+
+//fn largest_by_key
+
+
+
+
+fn main() {
+    // Пример из задания
+    let words = ["apple", "banana", "cherry"];
+    let longest = largest_by_key(&words, |s| s.len());
+    println!("{:?}", longest); // Some("banana")
+
+    // Дополнительные примеры
+    let numbers = [1, 42, 3, 100, 5];
+    let largest_num = largest_by_key(&numbers, |&n| n);
+    println!("{:?}", largest_num); // Some(100)
+
+    struct Person { name: String, age: u32 }
+    let people = [
+        Person { name: "Alice".to_string(), age: 30 },
+        Person { name: "Bob".to_string(), age: 25 },
+        Person { name: "Charlie".to_string(), age: 35 },
+    ];
+    let oldest = largest_by_key(&people, |p| p.age);
+    println!("Oldest: {:?}", oldest.map(|p| &p.name)); // Some("Charlie")
+}