Solution

src/herbivoresAndCarnivores.js

@@ -1,15 +1,50 @@
+/* eslint-disable prettier/prettier */
 'use strict';
 
 class Animal {
-  // write your code here
+  static alive = [];
+
+  constructor(name, health = 100) {
+    this.name = name;
+    this.health = health;
+    Animal.alive.push(this);
+  }
+
+  static removeDeadAnimals() {
+    Animal.alive = Animal.alive.filter((animal) => animal.health > 0);
+  }
 }
 
 class Herbivore extends Animal {
-  // write your code here
+  constructor(name, health = 100) {
+    super(name, health);
+    this.hidden = false;
+  }
+
+  hide() {
+    this.hidden = true;
+  }
 }
 
 class Carnivore extends Animal {
-  // write your code here
+  constructor(name, health = 100) {
+    super(name, health);
+  }
+
+  bite(target) {
+    if (
+      target instanceof Carnivore ||
+      (target instanceof Herbivore && target.hidden)
+    ) {
+      return `${this.name} cannot bite ${target.name}.`;
+    }
+
+    target.health -= 50;
+
+    if (target.health <= 0) {
+      Animal.removeDeadAnimals();
+    }
+  }
 }
 
 module.exports = {