Performance check with console.time()

If you want to compare the performance of multiple functions in JS, console.time() is your help.
Here is an example with Math.round() and Number.prototype.toFix().
You can see Math.round() is the winner.

Code

function one(number) {
  return Math.round(number * 100) / 100;
}

function two(number) {
  return number.toFixed(2);
}

let NUM_TRIALS = 1000000;
[one, two].forEach((func) => {
  console.time(func.name);
  for (let i = 0; i < NUM_TRIALS; ++i) {
    func(Math.random())
  }
  console.timeEnd(func.name);
});

Result

one: 23.06201171875 ms
two: 301.661865234375 ms

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