Run results for: flatMap vs reduce

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 15_4 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/100.0.4896.85 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 100

Operating system: iOS 15.4

Device Platform: Mobile

Date tested: 2 years ago

Test name	Executions per second
reduce with concat	4.7 Ops/sec
flatMap	8524.8 Ops/sec

Script Preparation code:

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

Tests:

reduce with concat
arr.reduce((acc, x) => [...acc, x, x], [])
flatMap
arr.flatMap(x => [x, x])

Run results for: flatMap vs reduce

reduce with concat

flatMap