Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_5) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.1.1 Safari/605.1.15
Safari 13
Mac OS X 10.15.5
Desktop
4 years ago
Test name Executions per second
undefined 3837007.8 Ops/sec
typeof 11389143.0 Ops/sec
in 11479663.0 Ops/sec
hasOwnProperty 11112280.0 Ops/sec
bool 11344615.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool