Run details:
Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36
Chrome 74
Windows 7
Desktop
5 years ago
Test name Executions per second
typeof x === "undefined" 8563068.0 Ops/sec
x === undefined 3240892.0 Ops/sec
x == undefined 3270093.2 Ops/sec
x == null 8883155.0 Ops/sec
Script Preparation code:
Tests:
  • typeof x === "undefined"

  • x === undefined

  • x == undefined

  • x == null


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