Run results for: flatMap vs flat+map

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_3_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.3.1 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 18

Operating system: iOS 18.3.2

Device Platform: Mobile

Date tested: one year ago

flatmap

10K/s

map+flat

4K/s

View exact numbers

Test name	Executions per second
✓ flatmap	10,166 Ops/sec
map+flat	3,849 Ops/sec

Script Preparation code:

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

Tests:

flatmap
arr.flatMap((x) => [x, x])
map+flat
arr.map((x) => [x, x]).flat()