Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.122 Safari/537.36
Chrome 81
Mac OS X 10.15.4
Desktop
4 years ago
Test name Executions per second
undefined 4555164.0 Ops/sec
typeof 12529668.0 Ops/sec
in 12208561.0 Ops/sec
hasOwnProperty 12422232.0 Ops/sec
bool 13645439.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool