Run details:
Mozilla/5.0 (X11; Linux x86_64; rv:67.0) Gecko/20100101 Firefox/67.0
Firefox 67
Linux
Desktop
5 years ago
Test name Executions per second
undefined 134268480.0 Ops/sec
typeof 340373824.0 Ops/sec
in 180160768.0 Ops/sec
hasOwnProperty 211351216.0 Ops/sec
bool 347877728.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool