setTimeout(), setInterval(), and requestAnimationFrame()

What does this code measure?

let fps = 0;
let lastSecond = performance.now();

requestAnimationFrame(function measure(now) {
  fps++;
  if (now - lastSecond >= 1000) {
    console.log(`FPS: ${fps}`);
    fps = 0;
    lastSecond = now;
  }
  requestAnimationFrame(measure);
});

CPU usage
Memory consumption
Frames per second
This code measures FPS by: 1) Counting frame callbacks per second, 2) Using performance.now() for precise timing, 3) Resetting counter every second, 4) Providing real-time performance metrics, 5) Useful for monitoring animation performance, 6) Essential for optimizing animations.
Animation duration

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