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

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/117.0.0.0 Safari/537.36

Browser: Chrome 117

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Object.fromEntries	19.0 Ops/sec
Reduce (reuse object)	160.6 Ops/sec
Reduce (creating temporary objects)	4.5 Ops/sec
Map	89.9 Ops/sec
for of	203.7 Ops/sec
for	200.0 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]; }