Run details:
Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:61.0) Gecko/20100101 Firefox/61.0
Firefox 61
Ubuntu
Desktop
6 years ago
Test name Executions per second
undefined 51651488.0 Ops/sec
typeof 126428752.0 Ops/sec
in 92818632.0 Ops/sec
hasOwnProperty 97202368.0 Ops/sec
bool 124783536.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool