Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.87 Safari/537.36
Chrome 80
Windows
Desktop
4 years ago
Test name Executions per second
undefined 3466339.5 Ops/sec
typeof 10906711.0 Ops/sec
in 10307167.0 Ops/sec
hasOwnProperty 9501915.0 Ops/sec
bool 11030477.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool