Run results for: Check function. typeof vs constructor + null check

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:91.0) Gecko/20100101 Firefox/91.0

Browser: Firefox 91

Operating system: Mac OS X 10.14

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
typeof	1026996000.0 Ops/sec
constructor	407006800.0 Ops/sec

Script Preparation code:

var fun = a => {};

Tests: