Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.86 Safari/537.36
Chrome 73
Mac OS X 10.14.4
Desktop
5 years ago
Test name Executions per second
undefined 4120616.5 Ops/sec
typeof 12338064.0 Ops/sec
in 11386063.0 Ops/sec
hasOwnProperty 11054734.0 Ops/sec
bool 12326596.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool