Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.117 Safari/537.36
Chrome 66
Mac OS X 10.13.3
Other
6 years ago
Test name Executions per second
undefined 4171976.0 Ops/sec
typeof 13085307.0 Ops/sec
in 11900602.0 Ops/sec
hasOwnProperty 11618770.0 Ops/sec
bool 13101348.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool