Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/12.1 Safari/605.1.15
Safari 12
Mac OS X 10.13.6
Desktop
5 years ago
Test name Executions per second
undefined 3525817.2 Ops/sec
typeof 8518231.0 Ops/sec
in 9084075.0 Ops/sec
hasOwnProperty 10296718.0 Ops/sec
bool 10174602.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool