Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36
Chrome 67
Windows
Desktop
6 years ago
Test name Executions per second
undefined 3690247.0 Ops/sec
typeof 13455848.0 Ops/sec
in 12240728.0 Ops/sec
hasOwnProperty 12345195.0 Ops/sec
bool 14044668.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • bool