Run results for: typeof undefined vs strict equal vs equal - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.36

Browser: Chrome 119

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
typeof	7526308.5 Ops/sec
strict equal undefined	3973655.0 Ops/sec
equal null	8024695.0 Ops/sec

Tests:

typeof
var foo = undefined; typeof foo === "undefined";
strict equal undefined
var foo = undefined; foo === undefined
equal null
var foo = undefined; foo == null