Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.0.1 Safari/605.1.15
Safari 14
Mac OS X 10.15.6
Desktop
4 years ago
Test name Executions per second
undefined 3607672.0 Ops/sec
typeof 11196851.0 Ops/sec
in 11127808.0 Ops/sec
hasOwnProperty 11057191.0 Ops/sec
bool 11176806.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool