Run results for: Undefined testing including ! - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Mobile Safari/537.36

Browser: Chrome Mobile 116

Operating system: Android

Device Platform: Mobile

Date tested: one year ago

Test name	Executions per second
typeof x === "undefined"	8513571.0 Ops/sec
x === undefined	2396693.5 Ops/sec
x == undefined	2381057.5 Ops/sec
x == null	8498695.0 Ops/sec
!x	8426194.0 Ops/sec

Script Preparation code:

var x;

Tests:

typeof x === "undefined"
typeof x === "undefined"
x === undefined
x === undefined
x == undefined
x == undefined
x == null
x == null
!x
!x