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

Object lookup performance

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Run details:
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36
Chrome 122
Linux
Desktop
2 years ago
bool
26.9M/s
in
26.4M/s
typeof
26.2M/s
hasOwnProperty
24.2M/s
undefined
9.8M/s
View exact numbers
Test name Executions per second
✓ bool 26,932,864 Ops/sec
in 26,422,022 Ops/sec
typeof 26,174,740 Ops/sec
hasOwnProperty 24,165,764 Ops/sec
undefined 9,829,638 Ops/sec
Script Preparation code:
Tests: