Run results for: instanceof vs undefined prop

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.164 Safari/537.36

Browser: Chrome 91

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
instanceof	2997859.8 Ops/sec
checking prop	9012467.0 Ops/sec

Script Preparation code:

var obj = {a:2};

Tests: