Run results for: update object at certain index in array .map() vs .slice()

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; rv:112.0) Gecko/20100101 Firefox/112.0

Browser: Firefox 112

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
.map()	8298053.5 Ops/sec
.slice()	4528051.5 Ops/sec

Tests:

.map()
const list = [{name: 'john'}, {name: 'doe'}, {name: 'jane'}, {name: 'dee'}]; const targetIndex = 2; const updated = list.map((item, itemIndex) => { if (itemIndex === targetIndex) return {name: 'albert'}; return item });
.slice()
const list = [{name: 'john'}, {name: 'doe'}, {name: 'jane'}, {name: 'dee'}]; const targetIndex = 2; const updated = [...list.slice(0, targetIndex), {name: 'albert'}, ...list.slice(targetIndex + 1)]