Run results for: Object.fromEntries + Object.entries vs Object.keys

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:124.0) Gecko/20100101 Firefox/124.0

Browser: Firefox 124

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

Object.fromEntries + Object.entries

1.5M/s

Object.keys

1.4M/s

View exact numbers

Test name	Executions per second
✓ Object.fromEntries + Object.entries	1,478,252 Ops/sec
Object.keys	1,423,033 Ops/sec

Script Preparation code:

var obj = {v1: {value: 'string', num: 123, obj: {boo: true, arr: [{str: 'string'},{str: 'string'},{str: 'string'},{str: 'string'},{str: 'string'}]}}, v2: {value: 'string', num: 123, obj: {boo: true, arr: [{str: 'string'},{str: 'string'},{str: 'string'},{str: 'string'},{str: 'string'}]}}}

Tests:

Object.fromEntries + Object.entries
JSON.stringify(Object.fromEntries(Object.entries(obj).map(([key, value]) => [key, {...value, obj: value.obj.arr}])))
Object.keys
const newObj = {} Object.keys(obj).forEach(key => { newObj[key] = { ...obj[key], ccSubset: obj[key]?.ccSubset?.ccSubset }; }); JSON.stringify(newObj)