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

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:74.0) Gecko/20100101 Firefox/74.0

Browser: Firefox 74

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
typeof	306302300.0 Ops/sec
constructor	111069100.0 Ops/sec

Script Preparation code:

var fun = a => {};

Tests: