Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36 Edg/91.0.864.67
Chrome 91
Windows
Desktop
3 years ago
Test name Executions per second
undefined 4345441.0 Ops/sec
typeof 13017977.0 Ops/sec
in 13028585.0 Ops/sec
hasOwnProperty 11783719.0 Ops/sec
bool 13066716.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool