Run results for: undefined vs. typeof vs. in vs. hasOwnProperty

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/124.0.0.0 Safari/537.36
Chrome 124
Mac OS X 10.15.7
Desktop
2 years ago
typeof
27.6M/s
in
27.5M/s
bool
27.2M/s
hasOwnProperty
24.1M/s
undefined
10.8M/s
View exact numbers
Test name Executions per second
✓ typeof 27,553,408 Ops/sec
in 27,501,630 Ops/sec
bool 27,208,240 Ops/sec
hasOwnProperty 24,107,038 Ops/sec
undefined 10,782,701 Ops/sec
Script Preparation code:
Tests: