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

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.139 Safari/537.36

Browser: Chrome 66

Operating system: Mac OS X 10.13.4

Device Platform: Other

Date tested: 6 years ago

Test name	Executions per second
Array.prototype.concat	651185.8 Ops/sec
spread operator	33262.1 Ops/sec

Script Preparation code:

var array1 = Array(400).fill().map(() => Math.round(Math.random() * 40));
var array2 = Array(400).fill().map(() => Math.round(Math.random() * 40));

AخA
 
var array1 = Array(400).fill().map(() => Math.round(Math.random() * 40));var array2 = Array(400).fill().map(() => Math.round(Math.random() * 40));

Tests:

Array.prototype.concat
var others = array1.concat(array2);
var others = array1.concat(array2);
spread operator
var others = [...array1, ...array2];
var others = [...array1, ...array2];

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

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

Array.prototype.concat

spread operator