Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.83 Safari/537.36
Chrome 85
Windows
Desktop
4 years ago
Test name Executions per second
undefined 3432374.0 Ops/sec
typeof 9259892.0 Ops/sec
in 9405559.0 Ops/sec
hasOwnProperty 8496609.0 Ops/sec
bool 9399566.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool