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Run results for: is variable not undefined? typeof variable !== "undefined" vs variable !== undefined

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Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.90 Safari/537.36
Chrome 89
Windows
Desktop
3 years ago
Test name Executions per second
typeof undefined is not "undefined" 5508259.0 Ops/sec
typeof string is not "undefined" 1524031488.0 Ops/sec
undefined is not undefined 2863073.5 Ops/sec
string is not undefined 5699837.5 Ops/sec
Tests:

  • typeof undefined is not "undefined"

  • typeof string is not "undefined"

  • undefined is not undefined

  • string is not undefined

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