Run results for: Javascript concat vs concat with ES6 spread vs ES6 construction with ES6 spread

Run details:

User agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36

Browser: Chrome 67

Operating system: Windows 7

Device Platform: Desktop

Date tested: 6 years ago

Test name	Executions per second
Concat	235383.5 Ops/sec
Concat with spread	22481.8 Ops/sec
ES6 construction with spreads	50350.1 Ops/sec

Script Preparation code:

var arr1 = [];
var arr2 = [];
for (var i=0; i<1000; i++){
  arr1.push(i);
  arr2.push(i);
}

Tests: