Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_3) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.0.5 Safari/605.1.15
Safari 13
Mac OS X 10.15.3
Desktop
4 years ago
Test name Executions per second
undefined 3270267.0 Ops/sec
typeof 8995505.0 Ops/sec
in 8847725.0 Ops/sec
hasOwnProperty 8933318.0 Ops/sec
bool 8930635.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool