Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36
Chrome 65
Mac OS X 10.13.4
Other
6 years ago
Test name Executions per second
undefined 4378649.5 Ops/sec
typeof 13098415.0 Ops/sec
in 12256465.0 Ops/sec
hasOwnProperty 12008519.0 Ops/sec
bool 13440152.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool