Run results for: reduce concat vs flat vs concat spread

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.130 Safari/537.36

Browser: Chrome 79

Operating system: Mac OS X 10.15.3

Device Platform: Desktop

Date tested: 4 years ago

Script Preparation code:

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

Tests: