Adding fullscreen to p5.js sketches

fullscreen.js

// Paste the following into any p5.js sketch, and press Enter to toggle fullscreen

function toggleFullScreen() {
  if (!document.fullscreenElement) {
    document.documentElement.requestFullscreen();
  } else if (document.exitFullscreen) {
    document.exitFullscreen();
  }
}

document.addEventListener(
  'keydown',
  (e) => {
    if (e.key === 'Enter') {
      toggleFullScreen();
    }
  },
  false,
);

// Optional but allows the sketch to automatically resize
function windowResized() {
  resizeCanvas(windowWidth, windowHeight);
}