Run details:
Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.150 Safari/537.36
Chrome 88
Windows 7
Desktop
3 years ago
Test name Executions per second
undefined 2663024.5 Ops/sec
typeof 8069860.0 Ops/sec
in 7536445.0 Ops/sec
hasOwnProperty 6682155.5 Ops/sec
bool 7128437.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool