Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36
Chrome 69
Mac OS X 10.14.0
Desktop
6 years ago
Test name Executions per second
undefined 3931211.5 Ops/sec
typeof 13225843.0 Ops/sec
in 12326313.0 Ops/sec
hasOwnProperty 11986910.0 Ops/sec
truthy 13474671.0 Ops/sec
local undef 6809661.5 Ops/sec
isDefined 6771278.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • truthy

  • local undef

  • isDefined