Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4003.0 Safari/537.36
Chrome 81
Mac OS X 10.15.1
Desktop
4 years ago
Test name Executions per second
undefined 2957011.0 Ops/sec
typeof 9505334.0 Ops/sec
in 9120997.0 Ops/sec
hasOwnProperty 8415555.0 Ops/sec
bool 9616550.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool