+1 for ordered set and dictionary, and please add ordered dictionary in ObjC as well.
Envoyé de mon iPhone > Le 9 juin 2017 à 03:11, Robert Bennett via swift-evolution > <swift-evolution@swift.org> a écrit : > > +1, and would also like to see OrderedDictionary as well. > >> On Jun 9, 2017, at 12:50 AM, Jeff Kelley via swift-evolution >> <swift-evolution@swift.org> wrote: >> >> I would be in favor of it; there have been a few times (including Core Data, >> as you mentioned) where I would have used it had it been available. >> >> >> Jeff Kelley >> >> slauncha...@gmail.com | @SlaunchaMan | jeffkelley.org >> >>> On Jun 7, 2017, at 2:10 PM, Maik Koslowski via swift-evolution >>> <swift-evolution@swift.org> wrote: >>> >>> Hello, >>> >>> in the past there have been a few requests for an OrderedSet implementation >>> in Swift. In the proposal >>> https://github.com/apple/swift-evolution/blob/master/proposals/0069-swift-mutability-for-foundation.md >>> was mentioned that the OrderedSet will be considered for the feature. >>> >>> However, since then there were a few discussions on OrderedSet but it >>> doesn’t get much attention and there wasn’t any comment about it from the >>> swift team. >>> >>> I want to bring up some points, why an OrderedSet is needed in the base >>> library. >>> >>> 1. CoreData is probably the most obvious place where people would use an >>> ordered set. Especially when working with large amounts of data, presorting >>> can save a lot of time and battery life. If a bridgeable ordered set was >>> part of the standard library we could use a ordered set in swift without >>> having to use the NSOrderedSet from objective c. Which would be pretty nice >>> in my opinion. Even when using a NSOrderedSet we couldn’t have a generic >>> version of it. >>> >>> 2. A shared datamodel between App and Server. One main advantage of having >>> web servers written in Swift is that we can share code between the server >>> and the app. For servers performance does matter a lot, since they are >>> usually working with much more data than apps. Databases are represented as >>> sets and fetching sorted data from the database can be represented as an >>> ordered set. However, since we don’t have ordered sets we have to choose >>> either a normal set or an array. Sets don’t have an order and arrays can >>> contain the same object multiple times, which makes them both a less >>> suitable choice. >>> >>> 3. Swift has the potential to be used for education. There is a lot of >>> support, for example the playground app on iPad. When it comes to the >>> theory behind data structures and algorithms or to the theory of >>> computation a defined order plays an important role. >>> >>> The biggest issue is that we always have to copy data from a set into an >>> array to have it in a sorted order with losing the safety of uniqueness. >>> Which is not suitable for a safe and performance oriented programming >>> language at all. >>> >>> Last but not least, it fits in the goals of Swift 4 stage 2 and an ordered >>> set can be found in other popular programming languages, too. >>> >>> What do you think? >>> >>> Best regards, >>> >>> Maik >>> >>> _______________________________________________ >>> 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 > _______________________________________________ > swift-evolution mailing list > swift-evolution@swift.org > https://lists.swift.org/mailman/listinfo/swift-evolution
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