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/134.0.0.0 Safari/537.36 OPR/119.0.0.0
Opera 119
Windows
Desktop
11 months ago
Test name Executions per second
undefined 254910672.0 Ops/sec
typeof 258150864.0 Ops/sec
in 242479632.0 Ops/sec
hasOwnProperty 156281216.0 Ops/sec
bool 261579248.0 Ops/sec
Script Preparation code:
Tests:

  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool