Can I compile swift 5.1 on Mojave with Xcode 11?

Question

I have Xcode 11 installed on my Mojave system (10.14.6). But Xcode doesn't let me choose Swift 5.1. What am I missing?

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Answer 1

Xcode 11 comes with Swift 5.1 compiler (even on Mojave) and you can easily check it with writing code with some Swift 5.1 feature.

func myFunc() -> String {
    "abc"
}

(SE-0255 Implicit returns from single-expression functions)

Just choose Swift 5 and you can use Swift 5.1 features.