Run details:
Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.117 Safari/537.36
Chrome 66
Windows 7
Other
6 years ago
Test name Executions per second
undefined 2588442.5 Ops/sec
typeof 8116859.0 Ops/sec
in 7507496.0 Ops/sec
hasOwnProperty 7561093.0 Ops/sec
bool 8237156.5 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool