Run results for: Object.fromEntries vs for of Object.keys

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36

Browser: Chrome 133

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

for of Object.keys

974K/s

Object.fromEntries with entries

826K/s

Object.fromEntries with keys

674K/s

Object.fromEntries with entries - destruction entry

627K/s

View exact numbers

Test name	Executions per second
✓ for of Object.keys	974,439 Ops/sec
Object.fromEntries with entries	826,037 Ops/sec
Object.fromEntries with keys	674,386 Ops/sec
Object.fromEntries with entries - destruction entry	626,634 Ops/sec

HTML Preparation code:


<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.21/lodash.min.js'></script>

Script Preparation code:

var data = Object.fromEntries(Array.from({
    length: 10000
}, (i) => ['key_' + i, i]));

Tests:

for of Object.keys
const output = {} for(const key of Object.keys(data)) { const newKey = _.camelCase(key) output[newKey] = data[key] }
Object.fromEntries with keys
Object.fromEntries(Object.keys(data).map((key) => [_.camelCase(key), data[key]]))
Object.fromEntries with entries
Object.fromEntries(Object.entries(data).map((entry) => [_.camelCase(entry[0]), entry[1]]))
Object.fromEntries with entries - destruction entry
Object.fromEntries(Object.entries(data).map(([key, value]) => [_.camelCase(key), value]))