Benchmark: for-in vs for loop

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

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

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

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:134.0) Gecko/20100101 Firefox/134.0

Browser/OS: Firefox 134 on Mac OS X 10.15

View result in a separate tab

Object.keys

5/s

Object.values

5/s

for-in

5/s

View exact numbers

Test name	Executions per second
✓ Object.keys	5 Ops/sec
Object.values	5 Ops/sec
for-in	5 Ops/sec

for-in vs for loop (version: 1)

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

Created: one year ago by: Guest

Go to the latest result

for-in

Object.keys

Object.values

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

for-in vs for loop (version: 1)

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

Created: one year ago by: Guest

Go to the latest result

for-in

Object.keys

Object.values

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Related benchmarks

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