Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36
Chrome 69
Mac OS X 10.14.0
Desktop
6 years ago
Test name Executions per second
undefined 4033119.2 Ops/sec
typeof 13745546.0 Ops/sec
in 12575960.0 Ops/sec
hasOwnProperty 12206395.0 Ops/sec
bool 13589755.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool