Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/12.0 Safari/605.1.15
Safari 12
Mac OS X 10.13.6
Desktop
6 years ago
Test name Executions per second
undefined 3461156.2 Ops/sec
typeof 9799276.0 Ops/sec
in 9953260.0 Ops/sec
hasOwnProperty 5377512.0 Ops/sec
bool 9524403.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool