Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.131 Safari/537.36
Chrome 92
Windows
Desktop
3 years ago
Test name Executions per second
typeof string is undefined 946449344.0 Ops/sec
typeof undefined is undefined 7822003.0 Ops/sec
string is undefined 8376258.0 Ops/sec
undefined is undefined 4136897.0 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