solved

src/viking.js

@@ -1,11 +1,87 @@
 // Soldier
-class Soldier {}
+class Soldier {
+	constructor(health, strength) {
+		this.health = health
+		this.strength = strength
+	}
+	attack() {
+		return this.strength
+	}
+	receiveDamage(damage) {
+		this.health -= damage
+	}
+}
 
 // Viking
-class Viking {}
+class Viking extends Soldier {
+	constructor(name, health, strength) {
+		super(health, strength)
+		this.name = name
+	}
+
+	receiveDamage(damage) {
+		this.health -= damage
+		return this.health > 0
+			? `${this.name} has received ${damage} points of damage`
+			: `${this.name} has died in act of combat`
+	}
+	battleCry() {
+		return 'Odin Owns You All!'
+	}
+}
 
 // Saxon
-class Saxon {}
+class Saxon extends Soldier {
+	receiveDamage(damage) {
+		this.health -= damage
+		return this.health > 0
+			? `A Saxon has received ${damage} points of damage`
+			: 'A Saxon has died in combat'
+	}
+}
 
 // War
-class War {}
+class War {
+	constructor() {
+		this.vikingArmy = []
+		this.saxonArmy = []
+	}
+	addViking(viking) {
+		this.vikingArmy.push(viking)
+	}
+	addSaxon(saxon) {
+		this.saxonArmy.push(saxon)
+	}
+	vikingAttack() {
+		const saxonIndex = Math.floor(Math.random() * this.saxonArmy.length)
+		const vikingIndex = Math.floor(Math.random() * this.vikingArmy.length)
+		const strength = this.vikingArmy[vikingIndex].strength
+		const attack = this.saxonArmy[saxonIndex].receiveDamage(strength)
+		if (attack === 'A Saxon has died in combat') {
+			this.saxonArmy.splice(saxonIndex, 1)
+		}
+
+		return attack
+	}
+	saxonAttack() {
+		const saxonIndex = Math.floor(Math.random() * this.saxonArmy.length)
+		const vikingIndex = Math.floor(Math.random() * this.vikingArmy.length)
+		const strength = this.saxonArmy[saxonIndex].strength
+		const viking = this.vikingArmy[vikingIndex]
+		const attack = viking.receiveDamage(strength)
+		if (attack === `${viking.name} has died in act of combat`) {
+			this.vikingArmy.splice(vikingIndex, 1)
+		}
+		return attack
+	}
+
+	showStatus() {
+		if (this.saxonArmy.length === 0) {
+			return 'Vikings have won the war of the century!'
+		} else if (this.vikingArmy.length === 0) {
+			return 'Saxons have fought for their lives and survived another day...'
+		} else {
+			return 'Vikings and Saxons are still in the thick of battle.'
+		}
+	}
+}