Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.61 Safari/537.36
Chrome 83
Mac OS X 10.15.4
Desktop
4 years ago
Test name Executions per second
undefined 3186578.2 Ops/sec
typeof 9283579.0 Ops/sec
in 9128222.0 Ops/sec
hasOwnProperty 8198258.0 Ops/sec
bool 9340106.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool