Run results for: for in loop vs. .map

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:141.0) Gecko/20100101 Firefox/141.0

Browser: Firefox 141

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

.map

29.2M/s

for loop

16.6M/s

View exact numbers

Test name	Executions per second
✓ .map	29,228,638 Ops/sec
for loop	16,586,103 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)); }