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

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 14_0_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.0 Mobile/15E148 DuckDuckGo/7 Safari/605.1.15

Browser: Mobile Safari 14

Operating system: iOS 14.0.1

Device Platform: Mobile

Date tested: 4 years ago

Test name	Executions per second
Array.prototype.concat	3417141.0 Ops/sec
spread operator	5777246.5 Ops/sec

Script Preparation code:

var arr1 = [];
var arr2 = [];
for(let i = 0; i < 10; i++) {
  arr1.push(i);
  arr2.push(i);
}

Tests:

Array.prototype.concat
[].concat(arr1, arr2);
spread operator
[...arr1, ...arr2];

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

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

Array.prototype.concat

spread operator