Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.51 Safari/537.36
Chrome 99
Windows
Desktop
3 years ago
Test name Executions per second
typeof string is undefined 786826880.0 Ops/sec
typeof undefined is undefined 6539063.0 Ops/sec
string is undefined 6977767.0 Ops/sec
undefined is undefined 3438996.8 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