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 is variable undefined? typeof variable === "undefined" vs variable === undefined. WIth variable (version: 0)

Comparing whether checking is (typeof variable === "undefined") is faster than (variable === undefined)

Comparing performance of: typeof string is undefined vs typeof undefined is undefined vs string is undefined vs undefined is undefined

Created: 2 years ago by: Guest
Jump to the latest result
Tests:

  • typeof string is undefined

  • typeof undefined is undefined

  • string is undefined

  • undefined is undefined

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results
  • Test case name Result
    typeof string is undefined
    typeof undefined is undefined
    string is undefined
    undefined is undefined

    Fastest: N/A

    Slowest: N/A

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Latest run results:
Run details: (Test run date: 10 months ago)
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.36
Chrome 114 on Mac OS X 10.15.7
View result in a separate tab
Test name Executions per second
typeof string is undefined 1035503000.0 Ops/sec
typeof undefined is undefined 1029544000.0 Ops/sec
string is undefined 18126920.0 Ops/sec
undefined is undefined 18099980.0 Ops/sec