Run results for: Array concat vs. array 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/86.0.4240.111 Safari/537.36

Browser: Chrome 86

Operating system: Mac OS X 10.15.6

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
Array concat	4418177.0 Ops/sec
spread operator (appended)	26890680.0 Ops/sec
spread operator (prepended)	34465180.0 Ops/sec

Website performance monitoring

Tests:

Array concat
const arr = [1, 2, 3]; const res = arr.concat(4);
spread operator (appended)
const arr = [1, 2, 3]; const res = [...arr, 4];
spread operator (prepended)
const arr = [1, 2, 3]; const res = [0, ...arr];