Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.98 Safari/537.36
Chrome 71
Windows
Desktop
5 years ago
Test name Executions per second
undefined 3736652.2 Ops/sec
typeof 12231018.0 Ops/sec
in 10483343.0 Ops/sec
hasOwnProperty 10247855.0 Ops/sec
bool 12303456.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool