Run results for: Object.entries VS Object.keys VS Object.keys with extra array VS Object.entries without array 1234

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

Browser: Chrome 120

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Object.entries	35.9 Ops/sec
Object.keys	95.3 Ops/sec
Object.keys with extra array	54.0 Ops/sec
Object.entries without array	36.3 Ops/sec

Script Preparation code:



window.parentObj = {};

for (let i = 0; i < 100000; i++) {
	window.parentObj['id_'+i] = 'id_'+i;
}
console.log(window.parentObj);

Tests:

Object.entries
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) => { });
Object.keys with extra array
const newObj = {}; Object.keys(window.parentObj).forEach((k, i) => { const [extraK, v] = [k, window.parentObj[k]] });
Object.entries without array
const newObj = {}; Object.entries(window.parentObj).forEach((keyAndVal, i) => { });