Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.77 Safari/537.36
Chrome 70
Mac OS X 10.14.0
Desktop
6 years ago
Test name Executions per second
undefined 3927249.8 Ops/sec
typeof 12374138.0 Ops/sec
in 11457705.0 Ops/sec
hasOwnProperty 11050280.0 Ops/sec
bool 12252871.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool