---
id: 5d7e02c88360d21c6826a9b7
title: Part 101
challengeType: 0
isBeta: true
---

## Description
<section id='description'>

Check if health is less than or equal to zero. If it is, call the `lose()` function.

</section>

## Instructions
<section id='instructions'>

</section>

## Tests
<section id='tests'>

```yml
tests:
  - text: See description above for instructions.
    testString: assert(attack.toString().match(/^\s*if\s*\(\s*health\s*\<\=\s*0\s*\)\s*\{\s*lose\(\s*\);?\s*\}/m));

```

</section>

## Challenge Seed
<section id='challengeSeed'>

<div id='html-seed'>

```html
<script>
let xp = 0;
let health = 100;
let gold = 50;
let currentWeapon = 0;
let fighting;
let monsterHealth;
let inventory = ["stick"];

const button1 = document.querySelector('#button1');
const button2 = document.querySelector("#button2");
const button3 = document.querySelector("#button3");
const text = document.querySelector("#text");
const xpText = document.querySelector("#xpText");
const healthText = document.querySelector("#healthText");
const goldText = document.querySelector("#goldText");
const monsterStats = document.querySelector("#monsterStats");
const monsterNameText = document.querySelector("#monsterName");
const monsterHealthText = document.querySelector("#monsterHealth");

const weapons = [
	{
		name: "stick",
		power: 5
	},
	{
		name: "dagger",
		power: 30
	},
	{
		name: "claw hammer",
		power: 50
	},
	{
		name: "sword",
		power: 100
	}
];

const monsters = [
  {
    name: "slime",
    level: 2,
    health: 15
  },
  {
    name: "fanged beast",
    level: 8,
    health: 60
  },
  {
    name: "dragon",
    level: 20,
    health: 300
  }
];

const locations = [
	{
		name: "town square",
		"button text": ["Go to store", "Go to cave", "Fight dragon"],
		"button functions": [goStore, goCave, fightDragon],
		text: "You are in the town square. You see a sign that says \"Store.\""
	},
	{
		name: "store",
		"button text": ["Buy 10 health (10 gold)", "Buy weapon (30 gold)", "Go to town square"],
		"button functions": [buyHealth, buyWeapon, goTown],
		text: "You enter the store."
	},
	{
		name: "cave",
		"button text": ["Fight slime", "Fight fanged beast", "Go to town square"],
		"button functions": [fightSlime, fightBeast, goTown],
		text: "You enter the cave. You see some monsters."
	},
	{
		name: "fight",
		"button text": ["Attack", "Dodge", "Run"],
		"button functions": [attack, dodge, goTown],
		text: "You are fighting a monster."
	}
];

// initialize buttons
button1.onclick = goStore;
button2.onclick = goCave;
button3.onclick = fightDragon;

function update(location) {	
	button1.innerText = location["button text"][0];
	button2.innerText = location["button text"][1];
	button3.innerText = location["button text"][2];
	button1.onclick = location["button functions"][0];
	button2.onclick = location["button functions"][1];
	button3.onclick = location["button functions"][2];
	text.innerText = location.text;
}

function goTown() {
  update(locations[0]);
}

function goStore() {
  update(locations[1]);
}

function goCave() {
  update(locations[2]);
}

function buyHealth() {
  if (gold >= 10) {
    gold -= 10;
    health += 10;
    goldText.innerText = gold;
    healthText.innerText = health;
  } else {
    text.innerText = "You do not have enough gold to buy health.";
  }
}

function buyWeapon() {
	if (currentWeapon < weapons.length - 1) {
		if (gold >= 30) {
			gold -= 30;
			currentWeapon++;
			goldText.innerText = gold;
			let newWeapon = weapons[currentWeapon].name;
			text.innerText = "You now have a " + newWeapon + ".";
			inventory.push(newWeapon);
			text.innerText += " In your inventory you have: " + inventory;
		} else {
			text.innerText = "You do not have enough gold to buy a weapon.";
		}
	} else {
		text.innerText = "You already have the most powerful weapon!";
		button2.innerText = "Sell weapon for 15 gold";
		button2.onclick = sellWeapon;
	}
}

function sellWeapon() {
	if (inventory.length > 1) {
		gold += 15;
		goldText.innerText = gold;
		let currentWeapon = inventory.shift();
		text.innerText = "You sold a " + currentWeapon + ".";
		text.innerText += " In your inventory you have: " + inventory;
	} else {
    	text.innerText = "Don't sell your only weapon!";
  	}
}

function fightSlime() {
	fighting = 0;
	goFight();
}

function fightBeast() {
	fighting = 1;
	goFight();
}

function fightDragon() {
	fighting = 2;
	goFight();
}

function goFight() {
	update(locations[3]);
	monsterHealth = monsters[fighting].health;
	monsterStats.style.display = "block";
	monsterNameText.innerText = monsters[fighting].name;
	monsterHealthText.innerText = monsterHealth;
}

function attack() {
	text.innerText = "The " + monsters[fighting].name + " attacks.";
	text.innerText += " You attack it with your " + weapons[currentWeapon].name + ".";
	health -= monsters[fighting].level;
	monsterHealth -= weapons[currentWeapon].power + Math.floor(Math.random() * xp) + 1;
	healthText.innerText = health;
	monsterHealthText.innerText = monsterHealth;
}

function dodge() {
}

</script>
```

</div>


### Before Test
<div id='html-setup'>

```html
<!DOCTYPE html>
<html lang="en" >
<head>
  <meta charset="UTF-8">
  <title>RPG - Dragon Repeller</title>
  <style>
    body {
      background-color: darkblue;
    }
    #text {
      background-color: black;
      color: white;
      padding: 10px;
    }
    #game {
      max-width: 500px;
      max-height: 400px;
      background-color: lightgray;
      color: white;
      margin: 0 auto;
      padding: 10px;
    }
    #controls {
      border: 1px black solid;
      padding: 5px;
    }
    #stats {
      border: 1px black solid;
      color: black;
      padding: 5px;
    }
    #monsterStats {
      display: none;
      border: 1px black solid;
      color: white;
      padding: 5px;
      background-color: red;
    }
    .stat {
      padding-right: 10px;
    }
  </style>
</head>
<body>
<div id="game">
  <div id="stats">
    <span class="stat">XP: <strong><span id="xpText">0</span></strong></span>
    <span class="stat">Health: <strong><span id="healthText">100</span></strong></span>
    <span class="stat">Gold: <strong><span id="goldText">50</span></strong></span>
  </div>
  <div id="controls">
    <button id="button1">Go to store</button>
    <button id="button2">Go to cave</button>
    <button id="button3">Fight dragon</button>
  </div>
  <div id="monsterStats">
    <span class="stat">Monster Name: <strong><span id="monsterName"></span></strong></span>
    <span class="stat">Health: <strong><span id="monsterHealth"></span></strong></span>
  </div>
  <div id="text">Welcome to Dragon Repeller. You must defeat the dragon that is preventing people from leaving the town. You are in the town square. Where do you want to go? Use the buttons above.</div>
</div>
```

</div>


### After Test
<div id='html-teardown'>

```html
</body>
</html>
```

</div>


</section>

## Solution
<section id='solution'>


```html
<script>
let xp = 0;
let health = 100;
let gold = 50;
let currentWeapon = 0;
let fighting;
let monsterHealth;
let inventory = ["stick"];

const button1 = document.querySelector('#button1');
const button2 = document.querySelector("#button2");
const button3 = document.querySelector("#button3");
const text = document.querySelector("#text");
const xpText = document.querySelector("#xpText");
const healthText = document.querySelector("#healthText");
const goldText = document.querySelector("#goldText");
const monsterStats = document.querySelector("#monsterStats");
const monsterNameText = document.querySelector("#monsterName");
const monsterHealthText = document.querySelector("#monsterHealth");

const weapons = [
	{
		name: "stick",
		power: 5
	},
	{
		name: "dagger",
		power: 30
	},
	{
		name: "claw hammer",
		power: 50
	},
	{
		name: "sword",
		power: 100
	}
];

const monsters = [
  {
    name: "slime",
    level: 2,
    health: 15
  },
  {
    name: "fanged beast",
    level: 8,
    health: 60
  },
  {
    name: "dragon",
    level: 20,
    health: 300
  }
];

const locations = [
	{
		name: "town square",
		"button text": ["Go to store", "Go to cave", "Fight dragon"],
		"button functions": [goStore, goCave, fightDragon],
		text: "You are in the town square. You see a sign that says \"Store.\""
	},
	{
		name: "store",
		"button text": ["Buy 10 health (10 gold)", "Buy weapon (30 gold)", "Go to town square"],
		"button functions": [buyHealth, buyWeapon, goTown],
		text: "You enter the store."
	},
	{
		name: "cave",
		"button text": ["Fight slime", "Fight fanged beast", "Go to town square"],
		"button functions": [fightSlime, fightBeast, goTown],
		text: "You enter the cave. You see some monsters."
	},
	{
		name: "fight",
		"button text": ["Attack", "Dodge", "Run"],
		"button functions": [attack, dodge, goTown],
		text: "You are fighting a monster."
	}
];

// initialize buttons
button1.onclick = goStore;
button2.onclick = goCave;
button3.onclick = fightDragon;

function update(location) {	
	button1.innerText = location["button text"][0];
	button2.innerText = location["button text"][1];
	button3.innerText = location["button text"][2];
	button1.onclick = location["button functions"][0];
	button2.onclick = location["button functions"][1];
	button3.onclick = location["button functions"][2];
	text.innerText = location.text;
}

function goTown() {
  update(locations[0]);
}

function goStore() {
  update(locations[1]);
}

function goCave() {
	update(locations[2]);
}

function buyHealth() {
  if (gold >= 10) {
    gold -= 10;
    health += 10;
    goldText.innerText = gold;
    healthText.innerText = health;
  } else {
    text.innerText = "You do not have enough gold to buy health.";
  }
}

function buyWeapon() {
	if (currentWeapon < weapons.length - 1) {
		if (gold >= 30) {
			gold -= 30;
			currentWeapon++;
			goldText.innerText = gold;
			let newWeapon = weapons[currentWeapon].name;
			text.innerText = "You now have a " + newWeapon + ".";
			inventory.push(newWeapon);
			text.innerText += " In your inventory you have: " + inventory;
		} else {
			text.innerText = "You do not have enough gold to buy a weapon.";
		}
	} else {
		text.innerText = "You already have the most powerful weapon!";
		button2.innerText = "Sell weapon for 15 gold";
		button2.onclick = sellWeapon;
	}
}

function sellWeapon() {
	if (inventory.length > 1) {
		gold += 15;
		goldText.innerText = gold;
		let currentWeapon = inventory.shift();
		text.innerText = "You sold a " + currentWeapon + ".";
		text.innerText += " In your inventory you have: " + inventory;
	} else {
    	text.innerText = "Don't sell your only weapon!";
  	}
}

function fightSlime() {
	fighting = 0;
	goFight();
}

function fightBeast() {
	fighting = 1;
	goFight();
}

function fightDragon() {
	fighting = 2;
	goFight();
}

function goFight() {
	update(locations[3]);
	monsterHealth = monsters[fighting].health;
	monsterStats.style.display = "block";
	monsterNameText.innerText = monsters[fighting].name;
	monsterHealthText.innerText = monsterHealth;
}

function attack() {
	text.innerText = "The " + monsters[fighting].name + " attacks.";
	text.innerText += " You attack it with your " + weapons[currentWeapon].name + ".";
	health -= monsters[fighting].level;
	monsterHealth -= weapons[currentWeapon].power + Math.floor(Math.random() * xp) + 1;
	healthText.innerText = health;
	monsterHealthText.innerText = monsterHealth;
	if (health <= 0) {
		lose();
	}
}

function dodge() {
}
</script>
```

</section>