Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.132 Safari/537.36
Chrome 76
Windows
Desktop
5 years ago
Test name Executions per second
undefined 3789093.0 Ops/sec
typeof 12145528.0 Ops/sec
in 12033795.0 Ops/sec
hasOwnProperty 10062065.0 Ops/sec
bool 12071296.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool