microtime.js

export default function microtime(getAsFloat) {
  //  discuss at: http://locutus.io/php/microtime/
  // original by: Paulo Freitas
  // improved by: Dumitru Uzun (http://duzun.me)
  //   example 1: var $timeStamp = microtime(true)
  //   example 1: $timeStamp > 1000000000 && $timeStamp < 2000000000
  //   returns 1: true
  //   example 2: /^0\.[0-9]{1,6} [0-9]{10,10}$/.test(microtime())
  //   returns 2: true

  let s;
  let now;
  if (typeof performance !== 'undefined' && performance.now) {
    now = (performance.now() + performance.timing.navigationStart) / 1e3;
    if (getAsFloat) {
      return now;
    }

    // Math.round(now)
    s = now | 0;

    return `${Math.round((now - s) * 1e6) / 1e6} ${s}`;
  }

  now = (Date.now ? Date.now() : new Date().getTime()) / 1e3;
  if (getAsFloat) {
    return now;
  }

  // Math.round(now)
  s = now | 0;

  return `${Math.round((now - s) * 1e3) / 1e3} ${s}`;
}