Run results for: for of vs map with merge

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

Browser: Chrome 120

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
for of	3218470.8 Ops/sec
map	3229240.8 Ops/sec

Script Preparation code:

var arr = new Array(10).fill({aa:1,bb:2,cc:3})

Tests:

for of
const res = []; const y = {dd:4} for (const x of arr) { res.push({...x,...y,bb:x.bb + 1}) }
map
const y = {dd:4} arr.map((x) => ({...x,...y,bb:x.bb + 1}))