Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.114 Safari/537.36
Chrome 91
Mac OS X 10.14.6
Desktop
3 years ago
Test name Executions per second
undefined 4967076.5 Ops/sec
typeof 13460222.0 Ops/sec
in 13463457.0 Ops/sec
hasOwnProperty 12032589.0 Ops/sec
bool 13204690.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool