Swift 3 - Cannot assign type () to Array when using shuffle extension

Asked Dec 08 '16 at 09:11

Active Dec 08 '16 at 09:11

Viewed 107 times

I am attempting to shuffle an array using an shuffle extension. However the compiler is complaining it

Cannot assign value of type '()' to type '[EYPlayer]'

class SomeClass {
    var playerOrder: Array = [EYPlayer]()

    public func shufflePlayerOrder() {
        self.playerOrder = self.playerOrder.shuffle()
    }
}

The shuffle extension looks like:

extension MutableCollection where Index == Int {
    /// Shuffle the elements of `self` in-place.
    mutating func shuffle() {
        // empty and single-element collections don't shuffle
        if count < 2 { return }

        for i in startIndex ..< endIndex - 1 {
            let j = Int(arc4random_uniform(UInt32(endIndex - i))) + i
            if i != j {
                swap(&self[i], &self[j])
            }
        }
    }
}

I believe its asking me to cast the array but I am not sure.

What is the main issue here?

Thanks

asked Dec 08 '16 at 09:11

zardon

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3

Your `shuffle` method mutates the array in-place and doesn't return anything. Just remove `self.playerOrder = ` – Hamish Dec 08 '16 at 09:14
Ah, many thanks!! I perhaps was expecting it be returning when it wasn't. Many thanks -- accepted your answer – zardon Dec 08 '16 at 09:17
Why are you erasing type of content in `playerOrder`? – user28434'mstep Dec 08 '16 at 09:18
1

That code looks familiar http://stackoverflow.com/a/37843901/1187415 :) – Martin R Dec 08 '16 at 09:37
Yes, I am using your code on that. – zardon Dec 08 '16 at 11:36
I don't understand. I'd like to shuffle the order of self.playerOrder. I do not see where it is erasing it. – zardon Dec 08 '16 at 11:37

Swift 3 - Cannot assign type () to Array when using shuffle extension

0 Answers0