Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.79 Safari/537.36 Edge/14.14393
Chrome 51
Windows
Other
7 years ago
Test name Executions per second
typeof x === "undefined" 74167584.0 Ops/sec
x === undefined 7531059.5 Ops/sec
x == undefined 7140890.5 Ops/sec
x == null 22071864.0 Ops/sec
Script Preparation code:
Tests:
  • typeof x === "undefined"

  • x === undefined

  • x == undefined

  • x == null


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