Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.4 Safari/605.1.15
Safari 15
Mac OS X 10.15.7
Desktop
2 years ago
Test name Executions per second
undefined 9668957.0 Ops/sec
typeof 27645908.0 Ops/sec
in 27174116.0 Ops/sec
hasOwnProperty 27016014.0 Ops/sec
bool 27301180.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool