Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.0.2 Safari/605.1.15
Safari 14
Mac OS X 10.14.6
Desktop
4 years ago
Test name Executions per second
undefined 4066297.2 Ops/sec
typeof 12413941.0 Ops/sec
in 12611818.0 Ops/sec
hasOwnProperty 12458743.0 Ops/sec
bool 12632743.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool