Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.1.3 Safari/605.1.15
Safari 13
Mac OS X 10.15.7
Desktop
3 years ago
Test name Executions per second
undefined 4294658.0 Ops/sec
typeof 12968116.0 Ops/sec
in 12816973.0 Ops/sec
hasOwnProperty 12876477.0 Ops/sec
bool 12637430.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool