Enum raw value

 They are the values by which the enum is pre-populated. 


Eg enum ControlCharacter:Character {

    case tab = "\t"

    case return = "\r"

}

In this enum tab has the default value of "\t"


If you dont specify any raw value swift will automatically assign values 

Eg enum Direction:String {

case north, south, east, west

  }

Here Direction.east has a default raw value east. 

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