Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.102 Safari/537.36 Edge/18.18362
Edge 18.18362
Windows
Desktop
5 years ago
Test name Executions per second
undefined 6599943.5 Ops/sec
typeof 40621164.0 Ops/sec
in 14935785.0 Ops/sec
hasOwnProperty 12518960.0 Ops/sec
bool 38882056.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool