Run results for: Object values: Object.entries VS Object.keys VS Object.keys with extra array VS Object.entries without array

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.114 Safari/537.36

Browser: Chrome 89

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
Object.entries	41397.0 Ops/sec
Object.keys	61516.3 Ops/sec
Object.keys with extra array	38170.8 Ops/sec
Object.entries without array	43492.4 Ops/sec

Script Preparation code:

function makeid() {
  var text = "";
  var possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";

  for (var i = 0; i < 5; i++)
    text += possible.charAt(Math.floor(Math.random() * possible.length));

  return text;
}

window.parentObj = {};

for (let i = 0; i < 100; i++) {
	window.parentObj[makeid()] = { innerVal: makeid() };
}

​x
 
function makeid() {  var text = "";  var possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";​  for (var i = 0; i < 5; i++)    text += possible.charAt(Math.floor(Math.random() * possible.length));​  return text;}​window.parentObj = {};​for (let i = 0; i < 100; i++) {    window.parentObj[makeid()] = { innerVal: makeid() };}​​

Tests:

Object.entries

const newObj = {};
Object.entries(window.parentObj).forEach(([k, v], i) => {
  if ((i % 2) === 0) {
	newObj[k] = v;    
  }
});

 
const newObj = {};Object.entries(window.parentObj).forEach(([k, v], i) => {  if ((i % 2) === 0) {    newObj[k] = v;      }});

Object.keys

const newObj = {};
Object.keys(window.parentObj).forEach((k, i) => {
  if ((i % 2) === 0) {
	newObj[k] = window.parentObj[k];    
  }
});

 
const newObj = {};Object.keys(window.parentObj).forEach((k, i) => {  if ((i % 2) === 0) {    newObj[k] = window.parentObj[k];      }});

Object.keys with extra array

const newObj = {};
Object.keys(window.parentObj).forEach((k, i) => {
  const [extraK, v] = [k, window.parentObj[k]]
  if ((i % 2) === 0) {
	newObj[extraK] = v;    
  }
});

 
const newObj = {};Object.keys(window.parentObj).forEach((k, i) => {  const [extraK, v] = [k, window.parentObj[k]]  if ((i % 2) === 0) {    newObj[extraK] = v;      }});

Object.entries without array
const newObj = {}; Object.entries(window.parentObj).forEach((keyAndVal, i) => { if ((i % 2) === 0) { newObj[keyAndVal[0]] = keyAndVal[1]; } });
const newObj = {};
Object.entries(window.parentObj).forEach((keyAndVal, i) => {
if ((i % 2) === 0) {
newObj[keyAndVal[0]] = keyAndVal[1];
}
});