Run details:
Mozilla/5.0 (Windows NT 10.0; WOW64; Trident/7.0; rv:11.0) like Gecko
IE 11
Windows
Desktop
5 years ago
Test name Executions per second
undefined 9180084.0 Ops/sec
typeof 15210942.0 Ops/sec
in 14861128.0 Ops/sec
hasOwnProperty 14338245.0 Ops/sec
bool 64229248.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool