Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36
Chrome 65
Mac OS X 10.12.6
Other
6 years ago
Test name Executions per second
undefined 3783394.0 Ops/sec
typeof 12033061.0 Ops/sec
in 11170429.0 Ops/sec
hasOwnProperty 10938903.0 Ops/sec
bool 12227544.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool