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 4032779.5 Ops/sec
typeof 12652651.0 Ops/sec
in 12680803.0 Ops/sec
hasOwnProperty 12555528.0 Ops/sec
bool 12318462.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool