Run results for: reduce concat vs flat vs concat spread

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.149 Safari/537.36

Browser: Chrome 80

Operating system: Windows

Device Platform: Desktop

Date tested: 4 years ago

Script Preparation code:

var data = Array.from({length: 1000}, () => Array.from(Array(100).keys()));

Tests: