Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36
Chrome 126
Mac OS X 10.15.7
Desktop
7 months ago
Test name Executions per second
typeof string is undefined 239921760.0 Ops/sec
typeof undefined is undefined 20518070.0 Ops/sec
string is undefined 20346238.0 Ops/sec
undefined is undefined 10473260.0 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