Run results for: For in vs Object.entries

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 YaBrowser/24.12.0.0 Safari/537.36

Browser: Yandex Browser 24

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

For in

38/s

Object.entries

35/s

View exact numbers

Test name	Executions per second
✓ For in	38 Ops/sec
Object.entries	35 Ops/sec

Script Preparation code:

var obj = {}
for(i=0; i<10000; i++){
  obj['key_'+i] = Math.random();
}

Tests:

For in
for(let key in obj){ console.log(`${key}: ${obj[key]}`); }
Object.entries
for (const [key, value] of Object.entries(obj)) { console.log(`${key}: ${value}`); }