Run results for: Typeof x === 'undefined' vs x === undefined

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.79 Safari/537.36

Browser: Chrome 79

Operating system: Linux

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
Typeof check	12215730.0 Ops/sec
Strict equality	12097939.0 Ops/sec

Script Preparation code:

var x = undefined;

Tests: