Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.157 Safari/537.36
Chrome 74
Mac OS X 10.14.4
Desktop
5 years ago
Test name Executions per second
undefined 3975641.8 Ops/sec
typeof 11904603.0 Ops/sec
in 11866193.0 Ops/sec
hasOwnProperty 10594858.0 Ops/sec
bool 12053471.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool