Run results for: flatMap vs reduce (concat, spread, append)

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.36

Browser: Chrome 114

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 11 months ago

Script Preparation code:

var arr = Array(2000).fill(1).map(() => ({ items: Array(10).fill(1) }))

Tests: