Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.70 Safari/537.36
Chrome 78
Windows
Desktop
5 years ago
Test name Executions per second
undefined 4096158.5 Ops/sec
typeof 12394784.0 Ops/sec
in 10556364.0 Ops/sec
hasOwnProperty 7598258.5 Ops/sec
bool 9084161.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool