Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_2) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/12.0.2 Safari/605.1.15
Safari 12
Mac OS X 10.14.2
Desktop
5 years ago
Test name Executions per second
undefined 2307022.2 Ops/sec
typeof 6515559.5 Ops/sec
in 6364189.5 Ops/sec
hasOwnProperty 6534994.0 Ops/sec
bool 6544374.5 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool