Run details:
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.72 Safari/537.36
Chrome 89
Linux
Desktop
3 years ago
Test name Executions per second
undefined 4231654.5 Ops/sec
typeof 12073743.0 Ops/sec
in 12079770.0 Ops/sec
hasOwnProperty 9606502.0 Ops/sec
bool 12180157.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool