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

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.36

Browser: Chrome 119

Operating system: Linux

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

Object.keys

1.0M/s

Object.fromEntries + Object.entries

990K/s

View exact numbers

Test name	Executions per second
✓ Object.keys	1,015,966 Ops/sec
Object.fromEntries + Object.entries	989,858 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)