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

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.87 Safari/537.36

Browser: Chrome 67

Operating system: Mac OS X 10.13.6

Device Platform: Desktop

Date tested: 6 years ago

Test name	Executions per second
Concat	235924.6 Ops/sec
Concat with spread	13919.2 Ops/sec
ES6 construction with spreads	64883.6 Ops/sec

Script Preparation code:

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

Tests: