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

Object lookup performance

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Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36
Chrome 126
Windows
Desktop
2 years ago
typeof
8.4M/s
in
7.9M/s
bool
7.4M/s
hasOwnProperty
5.6M/s
undefined
2.5M/s
View exact numbers
Test name Executions per second
✓ typeof 8,392,619 Ops/sec
in 7,924,520 Ops/sec
bool 7,382,471 Ops/sec
hasOwnProperty 5,635,707 Ops/sec
undefined 2,521,809 Ops/sec
Script Preparation code:
Tests: