Run results for: Object.fromEntries vs reduce vs Map vs for of vs for

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:109.0) Gecko/20100101 Firefox/117.0

Browser: Firefox 117

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Object.fromEntries	405.0 Ops/sec
Reduce (reuse object)	1639.9 Ops/sec
Reduce (creating temporary objects)	0.3 Ops/sec
Map	845.1 Ops/sec
for of	3560.3 Ops/sec
for	3936.8 Ops/sec

Script Preparation code:

var data = { ...Array.from(Array(10000).keys()) };

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() }), {});
Map
Object.entries(data).reduce((acc, [k, v]) => { acc.set(k, v.toString()) return acc; }, new Map());
for of
const entries = Object.entries(data); const result = {} for (const entry of entries) { result[entry[0]] = entry[1]; }
for
const entries = Object.entries(data); const result = {} for (let i = 0; i < entries.length; i++) { result[entries[i][0]] = entries[i][1]; }