Run details:
Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.75 Safari/537.36
Chrome 68
Windows 7
Desktop
3 years ago
Test name Executions per second
!var1 7693809.5 Ops/sec
variable===undefined 2322574.0 Ops/sec
Script Preparation code:
Tests:
  • !var1

  • var1===undefined

  • var1 || var1==="" || var1===0

  • !(1 in arguments)

  • !arguments[1]

  • !object["var"]

  • !object[0]

  • !arguments["string"]


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