Error: Extra argument in call

Question

After using this code from a tutorial that apparently worked before, isn't working now using swift 3 but I'm not sure why. The error shows on the line: if !contains(uniqueValues, value as T)

extension Array {

    func unique<T: Equatable>() -> [T] {
        var uniqueValues = [T]();

        for value in self {
            if !contains(uniqueValues, value as T) {
                uniqueValues.append(value as! T);
            }
        }
        return uniqueValues;
    }

    func first<T>(test:(T) -> Bool) -> T? {
        for value in self {
            if test(value as! T) {
                return value as? T;
            }
        }
        return nil;
    }
}

You're jumping from Swift 1.2 to Swift 3... that's a huge leap. :) There's many changes, you should read [the updated language guide](https://developer.apple.com/library/prerelease/content/documentation/Swift/Conceptual/Swift_Programming_Language/TheBasics.html#//apple_ref/doc/uid/TP40014097-CH5-ID309). — Eric Aya, Jul 05 '16 at 20:14
That `unique` impliementation is O(N^2), you should see http://stackoverflow.com/a/33553374/3141234 — Alexander, Jul 05 '16 at 20:17
Another one here: http://stackoverflow.com/questions/32159295/contains-in-xcode-7-beta-5. — Martin R, Jul 05 '16 at 20:45

Alexander · Accepted Answer · 2016-07-05T20:40:16.100

1

Since Swift 2, contains(_:) has been refactored into an instance method on Array:

if uniqueValues.contains(value as T)

edited Jul 05 '16 at 20:40

answered Jul 05 '16 at 20:14

Alexander

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Is it also a protocol extension method of SequenceType for sequences of Equatable elements (http://stackoverflow.com/a/25391725/1187415). – Martin R Jul 05 '16 at 20:34
@MartinR Oh thanks, I linked the wrong function! – Alexander Jul 05 '16 at 20:39

Error: Extra argument in call

1 Answers1