Run details:
Mozilla/5.0 (iPad; CPU OS 15_6 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/112.0.5615.167 Mobile/15E148 Safari/604.1
Chrome Mobile iOS 112
iOS 15.6
Tablet
one year ago
Test name Executions per second
typeof string is undefined 398535776.0 Ops/sec
typeof undefined is undefined 8137124.0 Ops/sec
string is undefined 8028890.0 Ops/sec
undefined is undefined 4079569.0 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