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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:108.0) Gecko/20100101 Firefox/108.0

Browser: Firefox 108

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
typeof	1470239000.0 Ops/sec
constructor	851709100.0 Ops/sec

Script Preparation code:

var fun = a => {};

Tests: