Run results for: Array concat vs spread operator vs push (without spread) - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.121 Safari/537.36

Browser: Chrome 85

Operating system: Mac OS X 10.15.6

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
Array.prototype.concat	4436406.0 Ops/sec
Spread Operator	27050580.0 Ops/sec
Array.prototype.push	39859920.0 Ops/sec

Website performance monitoring

Tests:

Array.prototype.concat
var a1 = [1,2,3,4]; var a2 = a1.concat('bar');
Spread Operator
var a1 = [1,2,3,4]; var a2 = [...a1, 'bar'];
Array.prototype.push
var a1 = [1,2,3,4]; var a2 = a1.push('bar');