Run results for: reduce (immutable) vs map + fromEntries

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; rv:78.0) Gecko/20100101 Firefox/78.0

Browser: Firefox 78

Operating system: Windows

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
reduce	0.2 Ops/sec
map + fromEntries	410.7 Ops/sec

Script Preparation code:

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

Tests:

reduce
Object.entries(data).reduce((acc, [k, v]) => ({ ...acc, [k]: v.toString() }), {});
map + fromEntries
Object.fromEntries(Object.entries(data).map(([k, v]) => ([k, v.toString()])));