Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.61 Safari/537.36
Chrome 83
Mac OS X 10.15.5
Desktop
4 years ago
Test name Executions per second
undefined 5077044.5 Ops/sec
typeof 15311387.0 Ops/sec
in 15225811.0 Ops/sec
hasOwnProperty 13169950.0 Ops/sec
bool 14560691.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool