Run details:
Mozilla/5.0 (iPhone; CPU iPhone OS 17_0 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.0 Mobile/15E148 Safari/604.1
Mobile Safari 17
iOS 17.0
Mobile
one year ago
Test name Executions per second
undefined 10595587.0 Ops/sec
typeof 26920132.0 Ops/sec
in 26973054.0 Ops/sec
hasOwnProperty 26915898.0 Ops/sec
bool 26372600.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool