Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.88 Safari/537.36
Chrome 79
Mac OS X 10.14.4
Desktop
4 years ago
Test name Executions per second
undefined 4615859.0 Ops/sec
typeof 13529794.0 Ops/sec
in 13194896.0 Ops/sec
hasOwnProperty 11166474.0 Ops/sec
bool 12045936.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool