Run results for: foreach: object keys vs object values vs object entries

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_6_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/141.0.7390.41 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 141

Operating system: iOS 18.6.2

Device Platform: Mobile

Date tested: 11 months ago

Benchmark engine: Benchmark.js

object with values

117K/s

object with keys

19K/s

object with entries 1

13K/s

object with entries 2

12K/s

View exact numbers

Test name	Executions per second
✓ object with values	117,429 Ops/sec
object with keys	18,941 Ops/sec
object with entries 1	13,396 Ops/sec
object with entries 2	11,858 Ops/sec

Script Preparation code:

var obj = {};

for (i = 0; i < 1000; ++i) {
  obj[i] = i;
}

Tests:

object with keys
Object.keys(obj).forEach( (key) => key, );
object with values
Object.values(obj).forEach( (value) => value, );
object with entries 1
Object.entries(obj).forEach( (entry) => entry, );
object with entries 2
Object.entries(obj).forEach( ([key, value]) => [key, value], );