Run results for: Object.fromEntries vs reduce (real object)

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.6 Safari/605.1.15

Browser: Safari 16

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 8 months ago

Test name	Executions per second
Object.fromEntries	541779.4 Ops/sec
Reduce (reuse object)	1159432.0 Ops/sec
Reduce (creating temporary objects)	587967.3 Ops/sec

Script Preparation code:

var data = Object.fromEntries([...Array(10)].map((v, i) => [`field${i}`, `value${i}`]));

Tests:

Object.fromEntries
Object.fromEntries(Object.entries(data).map((key, value) => [key, value]));
Reduce (reuse object)
Object.entries(data).reduce((acc, [k, v]) => { acc[k] = v.toString(); return acc; }, {});
Reduce (creating temporary objects)
Object.entries(data).reduce((acc, [k, v]) => ({ ...acc, [k]: v.toString() }), {});