Run results for: JS array union - concat vs spread

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36

Browser: Chrome 74

Operating system: Mac OS X 10.14.5

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
Array concat	7265390.0 Ops/sec
Array spread	5298775.0 Ops/sec

Tests: