Run details:
Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.103 Safari/537.36
Chrome 73
Windows 7
Desktop
5 years ago
Test name Executions per second
undefined 738995.9 Ops/sec
typeof 3912190.2 Ops/sec
in 5237849.0 Ops/sec
hasOwnProperty 5201939.5 Ops/sec
bool 5745045.5 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool