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Run results for: Check if obj.prop is undefined

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Run details:
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/63.0.3239.84 Chrome/63.0.3239.84 Safari/537.36
Chromium 63
Ubuntu
Other
2025 years ago
Test name Executions per second
typeof 16523037.0 Ops/sec
in 15259860.0 Ops/sec
== undefined 5186022.5 Ops/sec
Script Preparation code:
Tests:

  • typeof

  • in

  • == undefined

;