MeasureThat.net

Run results for: undefined vs. typeof vs. in vs. hasOwnProperty for non-existing property

Object lookup performance

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Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.93 Safari/537.36
Chrome 90
Mac OS X 10.15.7
Desktop
3 years ago
Test name Executions per second
undefined 9531777.0 Ops/sec
typeof 27321722.0 Ops/sec
in 27153054.0 Ops/sec
hasOwnProperty 22286436.0 Ops/sec
bool 27295202.0 Ops/sec
Script Preparation code:
Tests:

  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool

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