Benchmark: Object iteration benchmark

Script Preparation code:

const o = {};

for (let i = 0; i < 36; i++) {
  o[i.toString(36)] = 0;
}

Tests:

for with Object.keys()
const ks = Object.keys(o); for (let i = 0, l = ks.length; i < l; i++) { o[ks[i]]++; }
for of Object.keys()
for (const k of Object.keys(o)) { o[k]++; }
for in with Object.hasOwn()
for (const k in o) { if (Object.hasOwn(o, k)) { o[k]++; } }
for in
for (const k in o) { o[k]++; }

Rendered benchmark preparation results:

Previous results

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:140.0) Gecko/20100101 Firefox/140.0

Browser/OS: Firefox 140 on Mac OS X 10.15

for with Object.keys()

623K/s

for of Object.keys()

533K/s

for in

399K/s

for in with Object.hasOwn()

321K/s

View exact numbers

Object iteration benchmark (version: 3)