Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3626.96 Safari/537.36
Chrome 72
Windows
Desktop
5 years ago
Test name Executions per second
undefined 3247864.5 Ops/sec
typeof 9794414.0 Ops/sec
in 8919270.0 Ops/sec
hasOwnProperty 8517919.0 Ops/sec
bool 9683270.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool