Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.66 Safari/537.36
Chrome 87
Windows
Desktop
4 years ago
Test name Executions per second
undefined 4060442.8 Ops/sec
typeof 12066983.0 Ops/sec
in 11997397.0 Ops/sec
hasOwnProperty 10939403.0 Ops/sec
bool 12129687.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool