Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36
Chrome 69
Windows
Desktop
6 years ago
Test name Executions per second
undefined 3252326.5 Ops/sec
typeof 9773020.0 Ops/sec
in 8927788.0 Ops/sec
hasOwnProperty 4524568.0 Ops/sec
bool 9799933.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool