Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/105.0.0.0 Safari/537.36
Chrome 105
Mac OS X 10.15.7
Desktop
2 years ago
Test name Executions per second
typeof 6501529.5 Ops/sec
strict equal undefined 3219038.5 Ops/sec
equal null 6580301.0 Ops/sec
Tests:
  • typeof

    AخA
     
    var foo = undefined;
    typeof foo === "undefined";
  • strict equal undefined

     
    var foo = undefined;
    foo === undefined
  • equal null

     
    var foo = undefined;
    foo == null