On Fri, May 5, 2017 at 03:11 André Videla <andre.vid...@gmail.com> wrote:
> > Just to make sure: > > let pair = (x: 3, y: 5) > Let swapped: (y: Int, x: Int) = pair > Error. Let (y: x1, x: y1) = pair > Error. Let (x: x2, y: y2) = pair > With the revised pitch that no longer prohibits all labels, x2 is 3 and y2 is 5. In the original version, error. Let (x3, y3) = pair > x3 is 3 and y3 is 5. After the change, What do (x_n, y_n) print and Which assignments are errors? > > Andre Videla > > On 5 May 2017, at 09:31, Xiaodi Wu via swift-evolution < > swift-evolution@swift.org> wrote: > > On Fri, May 5, 2017 at 2:28 AM, Adrian Zubarev < > adrian.zuba...@devandartist.com> wrote: > >> I’m not arguing to remove all labels in Swift. Labels are great, this is >> a fact for sure. The point I was trying to make is that labels in tuples >> how either a meaning or not at all. >> >> // This is a shortcut for the tuple type `(x: Int, y: Int)` >> let foo = (x: 0, y: 0) >> >> // In this case the labels are only used for description, >> // they do not server any benefit here are most likely redundant >> let (x: x, y: y) = foo >> >> Labels elsewhere are a different story and I do support the cosmetic >> addition Chris Lattner sketched out here: >> https://lists.swift.org/pipermail/swift-evolution-announce/2016-July/000233.html >> >> However this is about closures and not tuples, I don’t think this would >> anyhow affect the removal of labels in tuple destructuring. >> >> Plus I don’t see this to create an inconsistent in Swift, because as I >> already said, labels in tuple destructuring are useless. >> > How come? I just illustrated their use. They help humans write correct > code by allowing the compiler to check an assertion that the human knows > which labels go with which positions in the tuple. > > _______________________________________________ > > > swift-evolution mailing list > swift-evolution@swift.org > https://lists.swift.org/mailman/listinfo/swift-evolution > >
_______________________________________________ swift-evolution mailing list swift-evolution@swift.org https://lists.swift.org/mailman/listinfo/swift-evolution
