Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.1.2 Safari/605.1.15
Safari 13
Mac OS X 10.14.6
Desktop
4 years ago
Test name Executions per second
undefined 2813896.0 Ops/sec
typeof 8653314.0 Ops/sec
in 8703927.0 Ops/sec
hasOwnProperty 8325923.0 Ops/sec
bool 8370420.5 Ops/sec
Object.prototype.hasOwnProperty 1769988.4 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool

  • Object.prototype.hasOwnProperty