Moreover, this would free up $ as an operator. I'm for removing it. I'm not sure about #n, since all code is ‘compiler magic’ when it gets down to it, but this feature is commonly used enough that I don't think edge-case syntax is appropriate. Newcomers to the language would read #2 as ‘argument number 2’ (with hash being used as a number sign), diluting the meaning somewhat.
I'm leaning towards .n, since these are contextual values. ------------ Begin Message ------------ Group: gmane.comp.lang.swift.evolution MsgID: <d63cf3bb-a278-4428-82ca-6d47aa024...@douwere.com> This was the point : $ has precedent in unix shell programming with one-based counting, and zero-based counting is used in Swift. Replacing $n with #n helps on improving consistency of syntax in a small way (a focus of Swift 3), by removing this incoherence. > On 30 May 2016, at 23:17, Erica Sadun <er...@ericasadun.com> wrote: > > >> On May 30, 2016, at 2:19 PM, FrĂ©dĂ©ric Blondiau via swift-evolution >> <swift-evolution@swift.org> wrote: >> >> I personally never found that this “$n” convention was >> “Swift-like”... but it’s true that a “$n” is easier to spot than a >> “.n”, and I got used to also. >> >> However, I realised how much this was disturbing for newcomers, when >> explaining closure shorthand argument names to a classroom of computer >> science students (aged 21) discovering Swift. >> >> The feedback some gave me, during the course, was quite surprisingly strong >> and negative about this “$n” convention. This convinced me to write this >> proposal : for newcomers, the “$n” zero-based is something wrong. >> >> I understand that association between tuples and function parameters in >> Swift is to be removed, but, in this case, as we have no parameters at all, >> I thought this was a distinct enough situation. >> >> As suggested, considering this is a kind of compiler magic, using #0, #1 >> instead, may indeed be a better alternative. >> >> I’m still waiting some feedback before writing an official proposal. > > I really don't see a pressing need to change this. Zero-based counting is > used in Swift arrays. I don't think the $-prefix is either superior or > inferior to alternatives such as # or %, and has precedent in unix shell > programming. Swift closures allow you to easily introduce meaningful names by > using a closure signature with a parameter clause. > > -- E _______________________________________________ swift-evolution mailing list swift-evolution@swift.org https://lists.swift.org/mailman/listinfo/swift-evolution ëb ------------- End Message ------------- From James F _______________________________________________ swift-evolution mailing list swift-evolution@swift.org https://lists.swift.org/mailman/listinfo/swift-evolution
