Run details:
Mozilla/5.0 (iPad; CPU OS 12_4 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/12.1.2 Mobile/15E148 Safari/604.1
Mobile Safari 12
iOS 12.4
Tablet
5 years ago
Test name Executions per second
undefined 1374871.5 Ops/sec
typeof 4042711.2 Ops/sec
in 4152046.0 Ops/sec
hasOwnProperty 4233904.0 Ops/sec
bool 3559891.5 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool