Try to return in ternary expression

Question

I have a Swift application.

I'm getting the error Expected expression after '?' in ternary expression from Xcode compiler

in

private func getContentPre(highlight: Highlight) -> String!

    {
        highlight.contentPre.count == 0 ? return ">" : return highlight.contentPre
    }

Apple docs says:

why isn't it possible to return in ternary expression like using if statement?

Please read [documentation](https://docs.swift.org/swift-book/LanguageGuide/BasicOperators.html#ID71) — Aleksey Potapov, Dec 13 '19 at 16:23
`return highlight.contentPre.count == 0 ? ">" : highlight.contentPre`, maybe...? or just write the evaluation out: `if highlight.contentPre.count == 0 { return ">" } else { return highlight.contentPre }` — holex, Dec 13 '19 at 16:47

score 3 · Accepted Answer · answered Dec 13 '19 at 16:23

You should re-write your function like this. This will evaluate the count of the contentPre variable and return the appropriate response.

private func getContentPre(highlight: Highlight) -> String! {
    return highlight.contentPre.count == 0 ? ">" :  highlight.contentPre
}

However as it would appear that contentPre would be a String you should use .isEmpty as it is more performant that checking the length of a String

private func getContentPre(highlight: Highlight) -> String! {
    return highlight.contentPre.isEmpty ? ">" :  highlight.contentPre
}

score -2 · Answer 2 · answered Dec 13 '19 at 16:17

-2

return does not return anything - I mean, to the function what calls it. Ternary operator's parameters must be expressions.

answered Dec 13 '19 at 16:17

CoderCharmander

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Try to return in ternary expression

2 Answers2