Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36
Chrome 68
Windows
Desktop
6 years ago
Test name Executions per second
undefined 4052044.0 Ops/sec
typeof 12709811.0 Ops/sec
in 10360009.0 Ops/sec
hasOwnProperty 10441775.0 Ops/sec
bool 12906578.0 Ops/sec
keys 2922956.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool

  • keys