Run results for: Object.fromEntries vs reduce 341235

Run details:

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.0

Browser: Firefox 91

Operating system: Ubuntu

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Object.fromEntries	122.3 Ops/sec
Reduce (reuse object)	722.7 Ops/sec
Object.fromEntries with reduce	361.3 Ops/sec

Script Preparation code:

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

Tests:

Object.fromEntries
Object.fromEntries(Object.entries(data).map((key, value) => [key, null]));
Reduce (reuse object)
Object.entries(data).reduce((acc, [k, v]) => { acc[k] = null; return acc; }, {});
Object.fromEntries with reduce
Object.fromEntries(Object.entries(data).reduce((acc, [k, v], i) => { acc.push([k, null]); return acc; }, []));