Create a 1-element array from a random element in a String array

Question

I am trying to write a swift function that returns a single element array from a randomly-selected element of a String array (allFruits).

Goal:

let allFruits:[String] = ["Apples", "Oranges", "Pears", "Grapes", "Bananas"]

randomFruit = ["Apple"]

My progress:

let allFruits:[String] = ["Apples", "Oranges", "Pears", "Grapes", "Bananas"]

func randomFruit(arraySource:[String]) -> [String]{
    let randomItem = arraySource.randomElement()
    var singleArray:[String] = []
    return singleArray.append(contentsOf: randomItem)
}

I would then call this with randomFruit(arraySource: allFruits) to get ["Pears"]

The above return statement is giving me the error of:

Cannot convert return expression of type '()' to return type '[String]'

How can I return a random 1-element array from allFruits?

return singleArray.append(contentsOf: randomItem)-> singleArray.append(contentsOf: randomItem); return singleArray — Larme
– Larme, Commented Oct 4, 2022 at 21:01

carlynorama · Accepted Answer · 2022-10-04 21:26:31Z

1

randomItem in your code is an optional since .randomElement can return nil. This is confusing the .append() call at the end. The following should solve that issue.

func randomFruit(arraySource:[String]) -> [String]{
    if let item = arraySource.randomElement() {
        return [item]
    } else {
        return []
    }
}

answered Oct 4, 2022 at 21:26

carlynorama

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