Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.122 Safari/537.36
Chrome 81
Windows
Desktop
4 years ago
Test name Executions per second
undefined 3239310.5 Ops/sec
typeof 9501185.0 Ops/sec
in 9621302.0 Ops/sec
hasOwnProperty 8532602.0 Ops/sec
bool 9379724.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool