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Notice

Replit no longer maintains Kaboom. You may be interested in the community fork KaPlay.

Kaboom

kaboom

Kaboom is a JavaScript library that helps you make games fast and fun!

Start playing around with it in the Kaboom Playground

Examples

// initialize context
kaboom()

// define gravity
setGravity(2400)

// load a sprite called "bean"
loadSprite("bean", "sprites/bean.png")

// compose the player game object from multiple components and add it to the game
const bean = add([
    sprite("bean"),
    pos(80, 40),
    area(),
    body(),
])

// press space to jump
onKeyPress("space", () => {
    // this method is provided by the "body" component above
    bean.jump()
})

Kaboom uses a powerful component system to compose game objects and behaviors.

// add a game obj to the scene from a list of component
const player = add([
    // it renders as a sprite
    sprite("bean"),
    // it has a position
    pos(100, 200),
    // it has a collider
    area(),
    // it is a physical body which will respond to physics
    body(),
    // it has 8 of health
    health(8),
    // or give it tags for easier group behaviors
    "player",
    "friendly",
    // plain objects fields are directly assigned to the game obj
    {
        dir: vec2(-1, 0),
        dead: false,
        speed: 240,
    },
])

Blocky imperative syntax for describing behaviors

// .onCollide() comes from "area" component
player.onCollide("enemy", () => {
    // .hurt() comes from "health" component
    player.hurt(1)
})

// check fall death
player.onUpdate(() => {
    if (player.pos.y >= height()) {
        destroy(player)
        gameOver()
    }
})

// if 'player' onCollide with any object with tag "enemy", run the callback
player.onCollide("enemy", () => {
    player.hp -= 1
})

// all objects with tag "enemy" will move towards 'player' every frame
onUpdate("enemy", (e) => {
    e.move(player.pos.sub(e.pos).unit().scale(e.speed))
})

// move up 100 pixels per second every frame when "w" key is held down
onKeyDown("w", () => {
    player.move(0, 100)
})

Usage

Start a Project With create-kaboom

The fastest way to start a Kaboom game is with create-kaboom

$ npm init kaboom mygame

This will create a directory called mygame for you, containing all the files we need

$ cd mygame
$ npm run dev

Then open http://localhost:5173 and edit src/game.js

Install as NPM Package

$ npm install kaboom
import kaboom from "kaboom"

kaboom()

add([
    text("oh hi"),
    pos(80, 40),
])

also works with CommonJS

const kaboom = require("kaboom")

Note that you'll need to use a bundler like esbuild or webpack to use Kaboom with NPM

Browser CDN

This exports a global kaboom function

<script src="https://unpkg.com/kaboom@3000/dist/kaboom.js"></script>
<script>
kaboom()
</script>

or use with es modules

<script type="module">
import kaboom from "https://unpkg.com/kaboom@3000/dist/kaboom.mjs"
kaboom()
</script>

works all CDNs that supports NPM packages, e.g. jsdelivr, skypack

Documentation

Dev

  1. npm install to install dev packages
  2. npm run dev to start dev server
  3. go to http://localhost:8000/ and pick an example
  4. edit examples in examples/ to test

Check out CONTRIBUTION.md for full info.

Community

Games

Collection of games made with Kaboom, selected by Kaboom, here.

Misc