Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.212 Safari/537.36
Chrome 90
Windows
Desktop
3 years ago
Test name Executions per second
undefined 4408808.0 Ops/sec
typeof 12679666.0 Ops/sec
in 12517494.0 Ops/sec
hasOwnProperty 11216279.0 Ops/sec
bool 12559820.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool