Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/77.0.3865.90 Safari/537.36
Chrome 77
Mac OS X 10.14.6
Desktop
5 years ago
Test name Executions per second
undefined 5837191.0 Ops/sec
typeof 16130655.0 Ops/sec
in 15084906.0 Ops/sec
hasOwnProperty 13960031.0 Ops/sec
bool 17775294.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool