Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.130 Safari/537.36
Chrome 79
Windows
Desktop
4 years ago
Test name Executions per second
undefined 4691164.0 Ops/sec
typeof 14137090.0 Ops/sec
in 13591892.0 Ops/sec
hasOwnProperty 12019604.0 Ops/sec
bool 13775122.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool