Run details:
Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/77.0.3865.120 Safari/537.36
Chrome 77
Windows 7
Desktop
5 years ago
Test name Executions per second
undefined 1594899.9 Ops/sec
typeof 4108295.8 Ops/sec
in 4141524.0 Ops/sec
hasOwnProperty 3876996.5 Ops/sec
bool 4194850.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool