Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.88 Safari/537.36
Chrome 79
Mac OS X 10.15.2
Desktop
4 years ago
Test name Executions per second
undefined 5305858.0 Ops/sec
typeof 15202026.0 Ops/sec
in 15203712.0 Ops/sec
hasOwnProperty 13554501.0 Ops/sec
bool 14915928.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool