Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.103 Safari/537.36
Chrome 73
Mac OS X 10.14.2
Desktop
5 years ago
Test name Executions per second
undefined 3976564.5 Ops/sec
typeof 12210059.0 Ops/sec
in 11245669.0 Ops/sec
hasOwnProperty 10859349.0 Ops/sec
bool 12147217.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool