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iOS Swift Enums and Structs Enums Review Enums

Posted by Moath Maharmah
Moath Maharmah
3,613 Points

Enums RAW VALUES Why we use it ?

I'm confused a little bit about Enums Raw values

why do we use it ?

2 Answers

Wouter Janson
Wouter Janson
1,545 Points
Wouter Janson
Wouter Janson
1,545 Points

You can you the raw value to calculate with the enums. If you have an enumeration with all the planet in our solar system, you can give them a raw value type for the order in which they appear in our solar system.

So we could use logic with them:

enum Planet: Int {
    case Mercury = 1, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
//Auto numbering is on by default
}



let positionToFind = 9
if let somePlanet = Planet(rawValue: positionToFind) {
    switch somePlanet {
    case .Earth:
        print("Mostly harmless")
    default:
        print("Not a safe place for humans")
    }
} else {
    print("There isn't a planet at position \(positionToFind)")
}

This wil print "There isn't a planet at position 9" because there is no enum value with the raw value of 9. If positionToFind was 3, it would have printed: "Mostly harmless" because earth has the raw value of three

Moath Maharmah
Moath Maharmah
3,613 Points
Moath Maharmah
Moath Maharmah
3,613 Points

Thank you !