Ambiguous error when attempting to filter values using enum

Question

I have a filter that I am trying to use to compare one value to another. Here is the enum that I am using:

enum SomeEnum: String {

    case first  = "Hey"
    case second = "There"
    case third  = "Peace"

static let values = [first, second, third]

func pickOne() -> String {
        switch self {
        case .first:
            return "value 1"
        case .second:
            return "value 2"
        case .third:
            return "value 3"
    }
}

Here is where I am attempting to filter and find matching values:

array.append(SomeEnum.values.filter({$0.rawValue ==  anotherArray["id"] as! String}))

I end up getting an ambiguous error:

Cannot convert value of type '[SomeEnum]' to expected argument type 'String'

Any ideas?

What's your anotherArray? You're trying to subscript it like a dictionary — Hamish
– Hamish, Commented May 25, 2016 at 6:20

Dejan Skledar · Accepted Answer · 2016-05-25 07:09:07Z

1

The problem is, that SomeEnum.values return type is [SomeEnum] and not String.

And the append function expects the parameter to be String, instead it is [SomeEnum].

This is, what you need to change:

Change append to appendContentsOf, since filter function returns an array, and not a single value
Change the [SomeEnum] to [String] since you are adding it to a [String] array, like this.

This is the fix:

array.appendContentsOf(SomeEnum.values.filter({ $0.rawValue == "SomeString" }).map({ $0.PickOne() }))

edited May 25, 2016 at 7:09

answered May 25, 2016 at 6:20

Dejan Skledar

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2 Comments

butter_baby Over a year ago

I edited my code, but if I enter $0.rawValue == "Hey" then it returns "Hey". I'd like to return case .first value of "value 1". Does that make sense? The errors were fixed, tho! :D

butter_baby Over a year ago

Okay, I edited your answer. It works just fine now. Thanks!! :D

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