Benchmark: for-in vs object.keys vs object.values vs for loop for objects

Script Preparation code:

var obj = {
  'a': {
    id: 'a',
    num: 1
  },
  'b': {
    id: 'b',
    num: 1
  },
  'c': {
    id: 'c',
    num: 1
  },
  'd': {
    id: 'd',
    num: 1
  },
  'e': {
    id: 'e',
    num: 1
  },
  'f': {
    id: 'f',
    num: 1
  },
  'g': {
    id: 'g',
    num: 1
  },
};

Tests:

for-in
for (var i=10000; i > 0; i--) { for (var key in obj) { console.log(obj[key].id); } }
Object.keys
for (var i=10000; i > 0; i--) { Object.keys(obj).forEach(key => console.log(obj[key].id)); }
Object.values
for (var i=10000; i > 0; i--) { Object.values(obj).forEach(n => console.log(n.id)); }
for loop
for (var i=10000; i > 0; i--) { const keys = Object.keys(obj) for (let j = 0; j < keys.length; j++) { console.log(obj[keys[j]].id); } }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
for-in
Object.keys
Object.values
for loop

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 10 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:139.0) Gecko/20100101 Firefox/139.0

Browser/OS: Firefox 139 on Windows

View result in a separate tab

Test name	Executions per second
for-in	4.3 Ops/sec
Object.keys	4.1 Ops/sec
Object.values	4.3 Ops/sec
for loop	4.3 Ops/sec

Related benchmarks:

for-in vs object.keys vs object.values vs for loop for objects (version: 1)

Comparing performance of: for-in vs Object.keys vs Object.values vs for loop

Created: 10 months ago by: Guest

Jump to the latest result

for-in

Object.keys

Object.values

for loop

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A