Run results for: flatMap vs reduce (group count)

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36 Edg/131.0.0.0

Browser: Chrome 131

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

reduce with concat

8.4M/s

flatMap

10K/s

View exact numbers

Test name	Executions per second
✓ reduce with concat	8,358,828 Ops/sec
flatMap	10,362 Ops/sec

Script Preparation code:

var arr = Array(10).fill({items: Array(1000).fill(0)})

Tests: