Run results for: filter + map vs reduce 12345153

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_5_0 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/137.0.7151.107 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 137

Operating system: iOS 18.5.0

Device Platform: Mobile

Date tested: one year ago

reduce

238K/s

flatMap

10K/s

View exact numbers

Test name	Executions per second
✓ reduce	238,298 Ops/sec
flatMap	10,342 Ops/sec

Script Preparation code:

var values = []
for(i=0; i<1000; i++){ values.push([i, i]) }

Tests:

flatMap
values.flatMap(e => [e, e * 2])
reduce
values.reduce((acc, x) => { acc.push(i, i * 2); return acc; }, [])