Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.98 Safari/537.36
Chrome 71
Mac OS X 10.13.6
Desktop
5 years ago
Test name Executions per second
undefined 2930829.5 Ops/sec
typeof 9599420.0 Ops/sec
in 6949443.5 Ops/sec
hasOwnProperty 8152711.0 Ops/sec
bool 9812847.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool