> On Oct 20, 2016, at 2:52 AM, Benjamin Spratling via swift-evolution
> <[email protected]> wrote:
>
> struct Note {
> /// half-steps from middle-C, nil means the note is a rest
> var pitch:Int?
> //more properties
> init?(xmlNode: XMLNode) {
> if let pitchString:String = xmlNode.attributes[“pitch”], let
> pitchInt:Int = Int(pitchString) {
> pitch = pitchInt
> }
> //more code
> }
> }
>
> I could go write an extension on String to provide a computed integer
> property, but I’m not just talking about one case, I’m talking about all
> cases where we convert to types in this way.
>
> If “$” meant “identifier of result of previous expression”, I could write:
>
> init?(xmlNode: XMLNode) {
> pitch = xmlNode.attributes[“pitch”]?Int($)
> //more code
> }
Pretty cryptic. What's wrong with this?
pitch = xmlNode.attributes["pitch"].map { Int($0) }
--
Brent Royal-Gordon
Architechies
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