Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.98 Safari/537.36
Chrome 71
Mac OS X 10.14.2
Desktop
5 years ago
Test name Executions per second
undefined 3638843.8 Ops/sec
typeof 12245580.0 Ops/sec
in 11077184.0 Ops/sec
hasOwnProperty 10912401.0 Ops/sec
bool 12183652.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool