Run results for: concat 2 arrays: Array.prototype.concat vs spread operator

Run details:

User agent: Mozilla/5.0 (Linux; U; Android 8.1.0; pt-br; Redmi 5 Plus Build/OPM1.171019.019) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/61.0.3163.128 Mobile Safari/537.36 XiaoMi/MiuiBrowser/10.1.2

Browser: Chrome Mobile 61

Operating system: Android 8.1.0

Device Platform: Mobile

Date tested: 5 years ago

Test name	Executions per second
Array.prototype.concat	432868.8 Ops/sec
spread operator	279589.0 Ops/sec

Script Preparation code:

var a = [ 1, 2, 3 ];
var b = [ 4, 5, 6 ];

Tests:

Array.prototype.concat
var result = a.concat(b);
spread operator
var result = [ ...a, ...b ];

Run results for: concat 2 arrays: Array.prototype.concat vs spread operator

Compare the new ES6 spread operator with the traditional concat() method

Array.prototype.concat

spread operator