first eterations

src/herbivoresAndCarnivores.js

@@ -1,15 +1,93 @@
 'use strict';
 
 class Animal {
-  // write your code here
+  /**
+  static createAliveAnimalList() {
+    const alive = [];
+    const emptyslots = [];
+
+    const list = alive;
+
+    list.add = (animal) => {
+      if (emptyslots.length === 0) {
+        animal.index = alive.push(animal) - 1;
+      } else {
+        const index = emptyslots.pop();
+
+        animal.index = index;
+        alive[index] = animal;
+      }
+    };
+
+    list.remove = (animal) => {
+      alive[animal.index] = null;
+      emptyslots.push(animal.index);
+    };
+
+    return list;
+  }
+
+  static alive = Animal.createAliveAnimalList();
+*/
+
+  static alive = [];
+  static #emptyslots = [];
+
+  constructor(name, health = 100) {
+    this.name = name;
+    this._health = health;
+    this.addToAlive();
+  }
+
+  addToAlive() {
+    if (Animal.#emptyslots.length > 0) {
+      this.index = Animal.#emptyslots.pop();
+      Animal.alive[this.index] = this;
+
+      return;
+    }
+
+    this.index = Animal.alive.length;
+    Animal.alive.push(this);
+  }
+  get health() {
+    return this._health;
+  }
+  set health(value) {
+    this._health = value;
+
+    if (this._health <= 0) {
+      this.die();
+    }
+  }
+  takeDamage(value) {
+    this.health -= value;
+  }
+  die() {
+    Animal.alive[this.index] = null;
+    Animal.#emptyslots.push(this.index);
+  }
 }
 
 class Herbivore extends Animal {
-  // write your code here
+  constructor(name, health) {
+    super(name, health);
+    this.hidden = false;
+  }
+
+  hide() {
+    this.hidden = true;
+  }
 }
 
 class Carnivore extends Animal {
-  // write your code here
+  bite(animal) {
+    if (!(animal instanceof Herbivore) || animal.hidden) {
+      return;
+    }
+
+    animal.takeDamage(50);
+  }
 }
 
 module.exports = {