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

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/121.0.0.0 Safari/537.36
Chrome 121
Windows
Desktop
2 years ago
in
20.2M/s
typeof
20.0M/s
bool
19.2M/s
hasOwnProperty
18.1M/s
undefined
7.4M/s
View exact numbers
Test name Executions per second
✓ in 20,244,816 Ops/sec
typeof 20,021,340 Ops/sec
bool 19,194,742 Ops/sec
hasOwnProperty 18,133,332 Ops/sec
undefined 7,440,731 Ops/sec
Script Preparation code:
Tests: