Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.135 Safari/537.36
Chrome 84
Mac OS X 10.15.4
Desktop
4 years ago
Test name Executions per second
undefined 4092387.0 Ops/sec
typeof 12098926.0 Ops/sec
in 12019007.0 Ops/sec
hasOwnProperty 10655475.0 Ops/sec
bool 11708822.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool