Run results for: Array concat vs spread operator vs push (reduce)

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.36

Browser: Chrome 114

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Script Preparation code:

var source = Array.from({ length: 1000 }, (_, index) => index + 1);

Tests:

Array.prototype.concat
source.reduce((acc, cur) => { acc = acc.concat(cur + cur); return acc; }, [])
spread operator
source.reduce((acc, cur) => { acc = [...acc, cur + cur]; return acc; }, [])
Push
source.reduce((acc, cur) => { acc.push(cur + cur); return acc; }, [])