Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.132 Safari/537.36
Chrome 76
Mac OS X 10.14.6
Desktop
5 years ago
Test name Executions per second
undefined 4296005.0 Ops/sec
typeof 12795880.0 Ops/sec
in 12763290.0 Ops/sec
hasOwnProperty 11235663.0 Ops/sec
bool 12755641.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool