Function enum parameter type

Solution 1:

You can define a generic function which take as argument a type that is CaseIterable and RawRepresentable:

func enumToObj<T>(_ Enum:T.Type) -> [String: T.RawValue]
    where T: CaseIterable & RawRepresentable
{
    var enumsObject: [String: T.RawValue] = [:];
    
    for enumData in Enum.allCases {
        let value = enumData.rawValue;
        enumsObject["\(enumData)"] = value;
    }
    
    return enumsObject;
}


print(enumToObj(Animal.self))
// ["CAT": "cat", "DOG": "dog", "BIRD": "bird"]

print(enumToObj(Car.self))
// ["AUDI": "audi", "BMW": "bmw"]

Using reduce(into:_:) this can also be written as

func enumToObj<T>(_ Enum:T.Type) -> [String: T.RawValue]
    where T: CaseIterable & RawRepresentable
{
    return Enum.allCases.reduce(into: [:]) { (enumsObject, enumData) in
        let value = enumData.rawValue;
        enumsObject["\(enumData)"] = value;
    }
}