Run results for: Join vs Join2

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.90 Safari/537.36 Edg/89.0.774.57

Browser: Chrome 89

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
join	26613.0 Ops/sec
join2	30691.0 Ops/sec

Script Preparation code:

var join2 = (arr, val) => arr.reduce((str, v, i) => i ? `${str}${val}${v}` : v, '');
var arr1 = Array(1000).fill(null).map((x, i) => i.toString());

Tests: