Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.138 Safari/537.36
Chrome 81
Mac OS X 10.14.6
Desktop
4 years ago
Test name Executions per second
undefined 4053054.5 Ops/sec
typeof 12205052.0 Ops/sec
in 12236367.0 Ops/sec
hasOwnProperty 10688341.0 Ops/sec
bool 12173386.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool