Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/12.1 Safari/605.1.15
Safari 12
Mac OS X 10.13.6
Desktop
4 years ago
Test name Executions per second
undefined 3465326.8 Ops/sec
typeof 9886626.0 Ops/sec
in 9762870.0 Ops/sec
hasOwnProperty 9648482.0 Ops/sec
bool 9905315.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool