Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.129 Safari/537.36
Chrome 81
Mac OS X 10.14.5
Desktop
4 years ago
Test name Executions per second
undefined 4929605.0 Ops/sec
typeof 15996981.0 Ops/sec
in 16014269.0 Ops/sec
hasOwnProperty 13812753.0 Ops/sec
bool 16006518.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool