Benchmark: Object.fromEntries vs reduce vs Map vs Object.assign vs forEach

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());
forEach
const result = {}; Object.keys(data).forEach((key) => { result[key] = data[key].toString(); });
Object.assign
Object.assign( {}, ...Object.entries(data).map(([key, value]) => ({ [key]: value })) );

Rendered benchmark preparation results:

Previous results

Test case name	Result
Object.fromEntries
Reduce (reuse object)
Reduce (creating temporary objects)
Map
forEach
Object.assign

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Latest run results:

Run details: (Test run date: 23 days ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36

Browser/OS: Chrome 123 on Mac OS X 10.15.7

Test name	Executions per second
Object.fromEntries	301.0 Ops/sec
Reduce (reuse object)	3404.1 Ops/sec
Reduce (creating temporary objects)	121.4 Ops/sec
Map	2185.9 Ops/sec
forEach	2222.7 Ops/sec
Object.assign	171.9 Ops/sec

Object.fromEntries vs reduce vs Map vs Object.assign vs forEach (version: 1)