Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36
Chrome 78
Mac OS X 10.14.6
Desktop
5 years ago
Test name Executions per second
undefined 6734795.0 Ops/sec
typeof 18715256.0 Ops/sec
in 18729420.0 Ops/sec
hasOwnProperty 16552739.0 Ops/sec
bool 18932052.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool