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

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:86.0) Gecko/20100101 Firefox/86.0

Browser: Firefox 86

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
typeof	413261120.0 Ops/sec
strict equal undefined	415681376.0 Ops/sec
equal null	464967520.0 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