Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3626.109 Safari/537.36
Chrome 72
Mac OS X 10.14.3
Desktop
5 years ago
Test name Executions per second
undefined 6554429.0 Ops/sec
typeof 19519720.0 Ops/sec
in 16502828.0 Ops/sec
hasOwnProperty 17479466.0 Ops/sec
bool 19179440.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool