Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.81 Safari/537.36
Chrome 94
Mac OS X 10.15.7
Desktop
3 years ago
Test name Executions per second
typeof string is undefined 957773440.0 Ops/sec
typeof undefined is undefined 8102878.5 Ops/sec
string is undefined 8007153.0 Ops/sec
undefined is undefined 3941918.0 Ops/sec
Tests:
  • typeof string is undefined

    AخA
     
    typeof "not undefined" === "undefined"
  • typeof undefined is undefined

     
    typeof undefined === "undefined"
  • string is undefined

     
    "not undefined" === undefined
  • undefined is undefined

     
    undefined === undefined