Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.138 Safari/537.36
Chrome 81
Windows
Desktop
4 years ago
Test name Executions per second
undefined 4018949.8 Ops/sec
typeof 12144678.0 Ops/sec
in 12037416.0 Ops/sec
hasOwnProperty 10764781.0 Ops/sec
bool 11925182.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool