Run details:
Mozilla/5.0 (iPhone; CPU iPhone OS 12_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/12.1 Mobile/15E148 Safari/604.1
Mobile Safari 12
iOS 12.2
Mobile
5 years ago
Test name Executions per second
undefined 2430340.0 Ops/sec
typeof 5655510.5 Ops/sec
in 5391775.5 Ops/sec
hasOwnProperty 5681402.5 Ops/sec
bool 5764991.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool