Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.40 Safari/537.36
Chrome 67
Windows
Desktop
6 years ago
Test name Executions per second
typeof x === "undefined" 11777843.0 Ops/sec
x === undefined 3467391.2 Ops/sec
x == undefined 3430889.2 Ops/sec
x == null 11710773.0 Ops/sec
Script Preparation code:
Tests:
  • typeof x === "undefined"

  • x === undefined

  • x == undefined

  • x == null


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