Run results for: FlatMap method vs for loop 31-10-24

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_6_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/141.0.7390.96 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 141

Operating system: iOS 18.6.2

Device Platform: Mobile

Date tested: 9 months ago

for loop

62K/s

flatMap

13K/s

View exact numbers

Test name	Executions per second
✓ for loop	61,604 Ops/sec
flatMap	13,302 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; }

Run results for: FlatMap method vs for loop 31-10-24

Compare the performance of for loop vs flatMap method

flatMap

for loop