30-seconds-of-code/snippets/measure-time-taken-by-function.md

Measure time taken by function

Use performance.now() to get start and end time for the function, console.log() the time taken. First argument is the function name, subsequent arguments are passed to the function.

const timeTaken = callback => {
  const t0 = performance.now(), r = callback();
  console.log(performance.now() - t0);
  return r;
}
// timeTaken(() => Math.pow(2, 10)) -> 1024 (0.010000000009313226 logged in console)