Run results for: Bench flat map vs spread reduce

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 16_3_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) FxiOS/110.2 Mobile/15E148 Safari/605.1.15

Browser: Mobile Safari 16

Operating system: iOS 16.3.1

Device Platform: Mobile

Date tested: one year ago

Test name	Executions per second
spread	2462.1 Ops/sec
flatmap	10398.5 Ops/sec

Script Preparation code:

var arr = Array(10_000).fill([0,0,0])

Tests:

spread
arr.reduce((acc, item) => { acc.push(...item); return acc; }, []);
flatmap
arr.flatMap((item) => { return item; });

Run results for: Bench flat map vs spread reduce

spread

flatmap