+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
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