Run results for: for in loop vs. .map

Run details:

User agent: Mozilla/5.0 (iPad; CPU OS 18_3 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.3 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 18

Operating system: iOS 18.3

Device Platform: Tablet

Date tested: 7 months ago

.map

29.8M/s

for loop

2.1M/s

View exact numbers

Test name	Executions per second
✓ .map	29,807,562 Ops/sec
for loop	2,144,668 Ops/sec

Script Preparation code:

// Create sample data
var array = [1,2,3,4,5,6,7,8,9,0];

var manipulateFn = num => {
	return num * 2 * 3;
}

Tests:

.map
const newArray = array.map(i => manipulateFn(i));
for loop
const newArray = []; for (let val of array) { newArray.push(manipulateFn(val)); }