Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.116 Safari/537.36
Chrome 83
Windows
Desktop
4 years ago
Test name Executions per second
undefined 4390323.5 Ops/sec
typeof 12651090.0 Ops/sec
in 12621115.0 Ops/sec
hasOwnProperty 11597429.0 Ops/sec
bool 12622352.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool