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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 (Windows NT 10.0; rv:109.0) Gecko/20100101 Firefox/115.0
Firefox 115
Windows
Desktop
10 months ago
Test name Executions per second
equality 5584100.0 Ops/sec
typeof 5586317.5 Ops/sec
double-equal 5638271.5 Ops/sec
Script Preparation code:
AخA
 
window.obj = undefined
Tests:

  • equality

     
    window.obj === undefined

  • typeof

     
    typeof window.obj === 'undefined'

  • double-equal

     
    window.obj == undefined