Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.142 Safari/537.36
Chrome 75
Mac OS X 10.14.6
Desktop
5 years ago
Test name Executions per second
undefined 4761544.0 Ops/sec
typeof 12633259.0 Ops/sec
in 12665026.0 Ops/sec
hasOwnProperty 11465170.0 Ops/sec
bool 12401748.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool