Сергей Соколов

const getValues = (obj, count) =>
  count > 0
    ? Object.values(obj).slice(0, count)
    : [];

function getValues(obj, count) {
  const result = [];

  for (const k in obj) {
    if (result.length >= count) {
      break;
    } else if (obj.hasOwnProperty(k)) {
      result.push(obj[k]);
    }
  }

  return result;
}

"use strict";

var handleChange = function handleChange(e) {
  return function (dispatch) {
    dispatch({
      type: PROMO_CODE,
      payload: e.target.value
    });
  };
};

var t0 = performance.now();
doSomething();
var t1 = performance.now();
console.log("Call to doSomething took " + (t1 - t0) + " milliseconds.");

var t0, t1;
var results = [];

for (var i = 0; i < nTimes; i++) {
  t0 = performance.now();
  doSomething();
  t1 = performance.now();
  results.push(t1 - t0);
}

// если надо вывести результат
results.forEach(function(result, i) {
  console.log('Call to doSomething #' + (i + 1) + ' took ' + result + ' milliseconds.');
});