Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_4) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/12.1 Safari/605.1.15
Safari 12
Mac OS X 10.14.4
Desktop
5 years ago
Test name Executions per second
undefined 3287115.5 Ops/sec
typeof 9350419.0 Ops/sec
in 9505197.0 Ops/sec
hasOwnProperty 9932916.0 Ops/sec
bool 9678750.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool