Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.0.1 Safari/605.1.15
Safari 14
Mac OS X 10.15.6
Desktop
4 years ago
Test name Executions per second
undefined 3154900.5 Ops/sec
typeof 9059795.0 Ops/sec
in 8988005.0 Ops/sec
hasOwnProperty 9093285.0 Ops/sec
bool 9042402.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool