Run details:
Mozilla/5.0 (iPhone; CPU iPhone OS 13_6 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.1.2 Mobile/15E148 Safari/604.1
Mobile Safari 13
iOS 13.6
Mobile
4 years ago
Test name Executions per second
undefined 5567742.0 Ops/sec
typeof 15444948.0 Ops/sec
in 12496182.0 Ops/sec
hasOwnProperty 9597573.0 Ops/sec
bool 9552483.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool