[swift-evolution] ternary operator ?: suggestion

[Drew Crawford]

Strong -1, for all the reasons Andrey gave, although I think his point could benefit from examples.

Consider this case from my codebase, for which ?: is natural:

    ///http://docs.aws.amazon.com/AmazonS3/latest/API/sig-v4-header-based-auth.html
   func uriEncode(string: String, encodeSlash: Bool) -> String {
        var encodedString = ""
        for char in string.characters {
            if (char >= "A" && char <= "z") || (char >= "a" && char <= "z") || (char >= "0" && char <= "9") || char == "_" || char == "-" || char == "~" || char == "." {
                encodedString += "\(char)"
            }
            else if char == "/" {
                encodedString += encodeSlash ? "%2F" : "\(char)"
            }
            else {
                let literal = String(char)
                for byte in literal.utf8 {
                    encodedString += String(format: "%%2X", arguments: [Int(byte)])
                }
            }
        }
        return encodedString
    }

I think replacing with `let foo` and scopes lengthens, emphasizes, and draws attention to a very minor detail, de-emphaizing and obscuring the main idea of the function.





> On Dec 11, 2015, at 7:18 PM, Andrey Tarantsov via swift-evolution <swift-evolution at swift.org> wrote:
> 
> Strong -1; this turns a quick one-liner into a multiline monstrosity. When massaging coordinates and layouts in iOS apps, ?: is often helpful to handle corner cases inline.
> 
> A.
> 
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