Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.88 Safari/537.36
Chrome 87
Windows
Desktop
4 years ago
Test name Executions per second
undefined 4366848.0 Ops/sec
typeof 13034237.0 Ops/sec
in 12921712.0 Ops/sec
hasOwnProperty 11367092.0 Ops/sec
bool 12929469.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool