In this activity, we will use classes to make two RPG characters match against each other.
Open character.js and update the Character class. It should instantiate an object with the following properties:
Create a printStats() class method that prints the name, strength, and hitPoints for a character.
Create an attack(opponent) method that a character can use to deal damage (equal to their strength) to their opponent’s hitPoints.
Create two instances of a character, giving them different names, strength, and hitPoints.
Using setInterval, make each character take turns attacking each other.
printStats() after each attack to visualize the battle.
Use an isAlive method to check if each character has more than 0 hitPoints every turn. If either character has been defeated, stop the interval and end the game.
throw an error.class Character {
constructor(name, strength, hitPoints) {
if (!name) {
throw new Error("You are missing the name.");
}
if (!strength) {
throw new Error("You are missing the strength.");
}
if (!hitPoints) {
throw new Error("You are missing the hitPoints.");
}
this.name = name;
this.strength = strength;
this.hitPoints = hitPoints;
}
// method which prints all of the stats for a character
printStats() {
console.log(`Stats for ${this.name} are as following:`);
console.log(`Each attack will do ${this.strength} damage.`);
console.log(`${this.name} has ${this.hitPoints} hit points remaining!`);
console.log("------------");
}
// method which determines whether or not a character's "hitpoints" are less then zero
// and returns true or false depending upon the outcome
isAlive() {
if (this.hitPoints <= 0) {
console.log(`${this.name} has been defeated!`);
return false;
}
return true;
}
// method which takes in a second object and decreases their "hitPoints" by this character's strength
attack(opponent) {
console.log(`${this.name} hit ${opponent.name} for ${this.strength}`);
opponent.hitPoints -= this.strength;
}
}
// creates two unique characters using the "character" constructor
const grace = new Character("Grace", 30, 75);
const dijkstra = new Character("Dijkstra", 20, 105);
// This keeps track of whose turn it is
let graceTurn = true;
grace.printStats();
dijkstra.printStats();
const turnInterval = setInterval(() => {
// If either character is not alive, end the game
graceTurn = !graceTurn;
if (!grace.isAlive() || !dijkstra.isAlive()) {
clearInterval(turnInterval);
console.log("Game over!");
} else if (graceTurn) {
grace.attack(dijkstra);
dijkstra.printStats();
} else {
dijkstra.attack(grace);
grace.printStats();
}
}, 2000);