---
id: 62a8f2bc37675e77d5835235
title: Step 139
challengeType: 0
dashedName: step-139
---
# --description--
JavaScript possiede un operatore condizionale chiamato operatore ternario. Può essere usato come un'espressione `if-else` su una riga. The syntax is: `condition ? true : false`.
Ecco un esempio di espressione `if-else` cambiata in una ternaria:
```js
if (num > 5) {
bigger()
} else {
smaller()
}
num > 5 ? bigger() : smaller();
```
Cambia la nuova espressione `if-else` in una ternaria.
# --hints--
Dovresti rimuovere `if` e `else` dal blocco `else if`.
```js
const block = attack.toString().split("else if");
assert.notMatch(block[1], /if/);
assert.notMatch(block[1], /else/);
```
Dovresti verificare se `fighting` è uguale a `2`.
```js
const block = attack.toString().split("else if");
assert.match(block[1], /fighting\s*===\s*2/);
```
Usando la sintassi ternaria, dovresti chiamare `winGame` se `fighting` è uguale a `2`.
```js
const block = attack.toString().split("else if");
assert.match(block[1], /fighting\s*===\s*2\s*\?\s*winGame\(\)/);
```
Usando la sintassi ternaria, dovresti chiamare `defeatMonster` se `fighting` non è uguale a `2`.
```js
const block = attack.toString().split("else if");
assert.match(block[1], /fighting\s*===\s*2\s*\?\s*winGame\(\)\s*\:\s*defeatMonster\(\)/);
```
# --seed--
## --seed-contents--
```html
RPG - Dragon Repeller
XP: 0Health: 100Gold: 50
Monster Name: Health:
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.
```
```css
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, #stats {
border: 1px solid black;
padding: 5px;
color: black;
}
#monsterStats {
display: none;
border: 1px solid black;
padding: 5px;
color: white;
background-color: red;
}
.stat {
padding-right: 10px;
}
```
```js
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 monsterName = 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."
},
{
name: "kill monster",
"button text": ["Go to town square", "Go to town square", "Go to town square"],
"button functions": [goTown, goTown, goTown],
text: 'The monster screams "Arg!" as it dies. You gain experience points and find gold.'
},
{
name: "lose",
"button text": ["REPLAY?", "REPLAY?", "REPLAY?"],
"button functions": [restart, restart, restart],
text: "You die. ☠️"
}
];
// initialize buttons
button1.onclick = goStore;
button2.onclick = goCave;
button3.onclick = fightDragon;
function update(location) {
monsterStats.style.display = "none";
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";
monsterName.innerText = monsters[fighting].name;
monsterHealthText.innerText = monsterHealth;
}
--fcc-editable-region--
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();
} else if (monsterHealth <= 0) {
if (fighting === 2) {
winGame();
} else {
defeatMonster();
}
}
}
--fcc-editable-region--
function dodge() {
text.innerText = "You dodge the attack from the " + monsters[fighting].name;
}
function defeatMonster() {
gold += Math.floor(monsters[fighting].level * 6.7);
xp += monsters[fighting].level;
goldText.innerText = gold;
xpText.innerText = xp;
update(locations[4]);
}
function lose() {
update(locations[5]);
}
function restart() {
xp = 0;
health = 100;
gold = 50;
currentWeapon = 0;
inventory = ["stick"];
goldText.innerText = gold;
healthText.innerText = health;
xpText.innerText = xp;
goTown();
}
```