Run details:
Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.142 Safari/537.36
Chrome 75
Windows 7
Desktop
5 years ago
Test name Executions per second
undefined 808770.9 Ops/sec
typeof 2794398.0 Ops/sec
in 3173791.5 Ops/sec
hasOwnProperty 3313574.8 Ops/sec
bool 3033625.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool