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Swift version

// ๅ›žๅ ฑ Swift ็‰ˆๆœฌ
public func swiftVersion() -> String {
    
    #if swift(>=5.5)
    return ("Swift 5.5")
    
    #elseif swift(>=5.4)
    return ("Swift 5.4")
    
    #elseif swift(>=5.3)
    return ("Swift 5.3")
    
    #elseif swift(>=5.2)
    return ("Swift 5.2")
    
    #elseif swift(>=5.1)
    return ("Swift 5.1")
    
    #elseif swift(>=5.0)
    return ("Swift 5.0")
    
    
    #elseif swift(>=4.2)
    return ("Swift 4.2")
    
    #elseif swift(>=4.1)
    return ("Swift 4.1")
    
    #elseif swift(>=4.0)
    return ("Swift 4.0")
    
    #else
    return ("How OLD are you?")
    
    #endif
}

another example:

#if swift(>=4.2)
print("Swift 4.2")
#elseif swift(>=4.1)
print("Swift 4.1")
#elseif swift(>=4.0)
...
#endif

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