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

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 12_0 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/70.0.3538.75 Mobile/15E148 Safari/605.1

Browser: Chrome Mobile iOS 70

Operating system: iOS 12.0

Device Platform: Mobile

Date tested: 5 years ago

Test name	Executions per second
Array.prototype.concat	2268783.0 Ops/sec
spread operator	1670900.0 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