Run results for: Consume Object.entries vs Object.keys vs for..in vs for..of

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36

Browser: Chrome 135

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

Object.keys for..of

6.9M/s

Object.keys for

5.4M/s

for..in

5.3M/s

Object.entries

3.6M/s

Object.entries for..of

3.5M/s

View exact numbers

Script Preparation code:

var obj = {
	a: 1,
    b: 2,
	c: 3,
	d: 4,
	0: 'a',
  	1: 'b',
  	str: 'long string',
	nested: {
    	nested: 0
    },
	hello: 55.5
};

Tests:

Object.entries
for (let entries = Object.entries(obj), i = entries.length; --i >= 0;) { const [key] = entries[i] window.a = [key, obj[key]] }
for..in
for (const key in obj) { window.a = [key, obj[key]] }
Object.keys for
for (let keyArray = Object.keys(obj), i = keyArray.length, key = keyArray[--i]; i >= 0; key = keyArray[--i]) { window.a = [key, obj[key]] }
Object.keys for..of
for (const key of Object.keys(obj)) { window.a = [key, obj[key]] }
Object.entries for..of
for (const [key] of Object.entries(obj)) { window.a = [key, obj[key]] }