Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.181 Safari/537.36
Chrome 66
Mac OS X 10.12.6
Desktop
6 years ago
Test name Executions per second
undefined 3318283.2 Ops/sec
typeof 11475554.0 Ops/sec
in 10458582.0 Ops/sec
hasOwnProperty 10301335.0 Ops/sec
bool 11348257.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool