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Run results for: typeof undefined vs undefined equality check vs double-equal

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Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.0.3 Safari/605.1.15
Safari 14
Mac OS X 10.15.6
Desktop
3 years ago
Test name Executions per second
equality 2374201.5 Ops/sec
typeof 4854915.5 Ops/sec
double-equal 2484298.0 Ops/sec
Script Preparation code:
AخA
 
window.obj = undefined
Tests:

  • equality

     
    window.obj === undefined

  • typeof

     
    typeof window.obj === 'undefined'

  • double-equal

     
    window.obj == undefined