Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:121.0) Gecko/20100101 Firefox/121.0
Firefox 121
Windows
Desktop
one year ago
Test name Executions per second
typeof string is undefined 697428992.0 Ops/sec
typeof undefined is undefined 697516096.0 Ops/sec
string is undefined 687491008.0 Ops/sec
undefined is undefined 696407168.0 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