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; rv:138.0) Gecko/20100101 Firefox/138.0
Firefox 138
Windows
Desktop
7 months ago
in
730.8M/s
hasOwnProperty
708.2M/s
undefined
695.0M/s
typeof
663.7M/s
bool
657.7M/s
View exact numbers
Test name Executions per second
✓ in 730,780,288 Ops/sec
hasOwnProperty 708,181,056 Ops/sec
undefined 694,998,080 Ops/sec
typeof 663,690,048 Ops/sec
bool 657,673,536 Ops/sec
Script Preparation code:
Tests: