Run results for: FlatMap method vs for loop

Run details:

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:134.0) Gecko/20100101 Firefox/134.0

Browser: Firefox 134

Operating system: Ubuntu

Device Platform: Desktop

Date tested: one year ago

for loop

20K/s

flatMap

4K/s

View exact numbers

Test name	Executions per second
✓ for loop	20,073 Ops/sec
flatMap	3,565 Ops/sec

Script Preparation code:

var arr = Array(10_000).fill(0);

Tests:

flatMap
arr.flatMap(x => [x, x * 2]);
for loop
const n = arr.length; const acc = new Array(n * 2); for (let i = 0; i < n; i++){ const x = arr[i]; acc[i * 2] = x; acc[i * 2 + 1] = x * 2; }