Sort of part 2 to JavaScript notes.
JavaScript has a minimum time resolution of 4ms. If you do a setInterval with 1ms delay – it will be bumped to 4 ms.
var x = { val: 0 };
var id = setInterval(() => { x.val++; }, 1);
setTimeout(() => { clearInterval(id); console.log("X: ", x); }, 10000);
This code will print same value of x.val whether the delay is 1 or 4 ms.