Run results for: Diffs between mapping array and keys of array

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.212 Safari/537.36

Browser: Chrome 90

Operating system: Linux

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Array	8297226.0 Ops/sec
Keys	1700851.0 Ops/sec

Tests:

Array
const arr = [ { a: 1, b: 2, c: 3, }, { a: 1, b: 2, c: 3, }, { a: 1, b: 2, c: 3, }, { a: 1, b: 2, c: 3, }, { a: 1, b: 2, c: 3, }, { a: 1, b: 2, c: 3, }, { a: 1, b: 2, c: 3, }, { a: 1, b: 2, c: 3, }, { a: 1, b: 2, c: 3, }, { a: 1, b: 2, c: 3, }, ]; function mappingArr(array) { return array.map(item => ({ f: item.a, g: item.b, h: item.c, })) } mappingArr(arr);
Keys
const arr = [ { a: 1, b: 2, c: 3, }, { a: 1, b: 2, c: 3, }, { a: 1, b: 2, c: 3, }, { a: 1, b: 2, c: 3, }, { a: 1, b: 2, c: 3, }, { a: 1, b: 2, c: 3, }, { a: 1, b: 2, c: 3, }, { a: 1, b: 2, c: 3, }, { a: 1, b: 2, c: 3, }, { a: 1, b: 2, c: 3, }, ]; function mappingArr(array) { return Object.keys(array).map(item => ({ f: array[item].a, g: array[item].b, h: array[item].c, })) } mappingArr(arr);