Benchmark: Object.entries vs for..inasasdasdasd

Script Preparation code:

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

Tests:

Object.entries (forEach)
var lastK; var lastV; Object.entries(obj).forEach((key, value) => { lastK = key; lastV = value; });
for..in
var lastK; var lastV; for (var key in obj) { if (Object.hasOwn(obj, key)) { lastK = key; lastK = obj[key]; } }
Object.entries (for loop)
var lastK; var lastV; var entries = Object.entries(obj); for (var i = entries.length - 1; i >= 0; i--) { var e = entries[i]; lastK = e[0]; lastV = e[1]; }
for of entries
var lastK; var lastV; for (let [k, v] of Object.entries(obj)) { lastK = k; lastV = v; }
for of keys
var lastK; var lastV; for (let k of Object.keys(obj)) { lastK = k; lastV = obj[k]; }
keys for i
var lastK; var lastV; var keys = Object.keys(obj); for (var i = 0; i < keys.length; ++i) { var k = keys[i]; lastK = k; lastV = obj[k]; }
keys for i reverse
var lastK; var lastV; var keys = Object.keys(obj); for (var i = keys.length - 1; i >= 0; --i) { var k = keys[i]; lastK = k; lastV = obj[k]; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object.entries (forEach)
for..in
Object.entries (for loop)
for of entries
for of keys
keys for i
keys for i reverse

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 7 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/143.0.0.0 Safari/537.36

Browser/OS: Chrome 143 on Windows

View result in a separate tab

Object.entries (for loop)

39.5M/s

for of entries

38.6M/s

for of keys

25.9M/s

keys for i reverse

25.3M/s

keys for i

24.9M/s

for..in

21.0M/s

Object.entries (forEach)

7.5M/s

View exact numbers

Test name	Executions per second
✓ Object.entries (for loop)	39,543,340 Ops/sec
for of entries	38,566,872 Ops/sec
for of keys	25,859,682 Ops/sec
keys for i reverse	25,250,776 Ops/sec
keys for i	24,904,600 Ops/sec
for..in	21,045,324 Ops/sec
Object.entries (forEach)	7,512,955 Ops/sec

Object.entries vs for..inasasdasdasd (version: 1)

Comparing performance of: `Object.entries (forEach) vs for..in vs Object.entries (for loop) vs for of entries vs for of keys vs keys for i vs keys for i reverse`

Created: 7 months ago by: Guest

Go to the latest result

Object.entries (forEach)

for..in

Object.entries (for loop)

for of entries

for of keys

keys for i

keys for i reverse

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Object.entries vs for..inasasdasdasd (version: 1)

Comparing performance of: Object.entries (forEach) vs for..in vs Object.entries (for loop) vs for of entries vs for of keys vs keys for i vs keys for i reverse

Created: 7 months ago by: Guest

Go to the latest result

Object.entries (forEach)

for..in

Object.entries (for loop)

for of entries

for of keys

keys for i

keys for i reverse

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Related benchmarks

Comparing performance of: `Object.entries (forEach) vs for..in vs Object.entries (for loop) vs for of entries vs for of keys vs keys for i vs keys for i reverse`