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

Object lookup performance

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Run details:
Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/98.0.5000.0 Iron Safari/537.36
Chrome 98
Windows 7
Desktop
2 years ago
typeof
7.8M/s
in
7.7M/s
bool
7.5M/s
hasOwnProperty
7.0M/s
undefined
2.8M/s
View exact numbers
Test name Executions per second
✓ typeof 7,757,522 Ops/sec
in 7,660,080 Ops/sec
bool 7,495,311 Ops/sec
hasOwnProperty 6,998,288 Ops/sec
undefined 2,807,560 Ops/sec
Script Preparation code:
Tests: