Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.142 Safari/537.36
Chrome 75
Windows
Desktop
5 years ago
Test name Executions per second
undefined 3252343.5 Ops/sec
typeof 8573634.0 Ops/sec
in 8095047.5 Ops/sec
hasOwnProperty 7112350.5 Ops/sec
bool 7966303.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool