Run details:
Mozilla/5.0 (Windows NT 10.0; WOW64; Trident/7.0; rv:11.0) like Gecko
IE 11
Windows
Desktop
6 years ago
Test name Executions per second
undefined 12043703.0 Ops/sec
typeof 20968794.0 Ops/sec
in 19908422.0 Ops/sec
hasOwnProperty 19252814.0 Ops/sec
bool 88814304.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool