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 4099815.2 Ops/sec
typeof 13604449.0 Ops/sec
in 12387072.0 Ops/sec
hasOwnProperty 12082215.0 Ops/sec
truthy 13510322.0 Ops/sec
local undef 6803484.5 Ops/sec
isDefined 7115531.0 Ops/sec
Script Preparation code:
Tests:
  • undefined

  • typeof

  • in

  • hasOwnProperty

  • truthy

  • local undef

  • isDefined


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