Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/102.0.5005.63 Safari/537.36 Edg/102.0.1245.33
Chrome 102
Windows
Desktop
2 years ago
Test name Executions per second
typeof string is undefined 35498556.0 Ops/sec
typeof undefined is undefined 7873479.0 Ops/sec
string is undefined 7421035.5 Ops/sec
undefined is undefined 4276493.0 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