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    Creating a platformer game in JavaScript involves several steps, including setting up the game environment, handling player movement, and implementing collision detection. Below is a basic example to get you started.

    Setting Up the Game Environment

    First, create an HTML file with a canvas element where the game will be rendered.

    <!DOCTYPE html>
    <html>
    <head>
    <title>Platformer Game</title>
    <style>
    canvas {
    border: 1px solid black;
    }
    </style>
    </head>
    <body>
    <canvas id="gameCanvas" width="800" height="400"></canvas>
    <script src="app.js"></script>
    </body>
    </html>
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    Player Movement

    Next, create a JavaScript file (app.js) to handle player movement and game logic.

    const canvas = document.getElementById('gameCanvas');
    const ctx = canvas.getContext('2d');

    const player = {
    x: 50,
    y: 300,
    width: 50,
    height: 50,
    speed: 5,
    dx: 0,
    dy: 0
    };

    function drawPlayer() {
    ctx.fillStyle = 'blue';
    ctx.fillRect(player.x, player.y, player.width, player.height);
    }

    function clear() {
    ctx.clearRect(0, 0, canvas.width, canvas.height);
    }

    function newPos() {
    player.x += player.dx;
    player.y += player.dy;

    // Prevent player from going out of bounds
    if (player.x < 0) player.x = 0;
    if (player.x + player.width > canvas.width) player.x = canvas.width - player.width;
    }

    function update() {
    clear();
    drawPlayer();
    newPos();
    }

    function moveRight() {
    player.dx = player.speed;
    }

    function moveLeft() {
    player.dx = -player.speed;
    }

    function stop() {
    player.dx = 0;
    }

    // Event listeners for key presses
    document.addEventListener('keydown', (e) => {
    if (e.key === 'ArrowRight') moveRight();
    if (e.key === 'ArrowLeft') moveLeft();
    });

    document.addEventListener('keyup', (e) => {
    if (e.key === 'ArrowRight' || e.key === 'ArrowLeft') stop();
    });

    setInterval(update, 20);
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  3. expertbeacon.com
    https://expertbeacon.com › how-to-create-a-platformer-game-in-javascript

    How to Create a Platformer Game in JavaScript - ExpertBeacon

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