Run results for: flatMap vs reduce, but without copying the array in each iteration

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:124.0) Gecko/20100101 Firefox/124.0

Browser: Firefox 124

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: one month ago

Test name	Executions per second
reduce with concat	5664.4 Ops/sec
flatMap	4488.0 Ops/sec

Script Preparation code:

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

Tests: