Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.85 YaBrowser/21.11.0.2054 Yowser/2.5 Safari/537.36
Yandex Browser 21
Mac OS X 10.15.7
Desktop
3 years ago
Test name Executions per second
typeof string is undefined 942681792.0 Ops/sec
typeof undefined is undefined 7923341.0 Ops/sec
string is undefined 7915368.5 Ops/sec
undefined is undefined 3948542.5 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