Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36 OPR/109.0.0.0
Opera 109
Windows
Desktop
8 months ago
Test name Executions per second
typeof string is undefined 27985352.0 Ops/sec
typeof undefined is undefined 1840930.5 Ops/sec
string is undefined 1882830.9 Ops/sec
undefined is undefined 992269.0 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