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 2590045.5 Ops/sec
typeof 8678953.0 Ops/sec
in 8536206.0 Ops/sec
hasOwnProperty 7809245.5 Ops/sec
bool 6425690.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool