Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.181 Safari/537.36
Chrome 66
Mac OS X 10.12.6
Desktop
6 years ago
Test name Executions per second
undefined 2882241.2 Ops/sec
typeof 10459239.0 Ops/sec
in 9352949.0 Ops/sec
hasOwnProperty 9222333.0 Ops/sec
bool 10594779.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool