No to this pitch, because a percentage can be higher than 100%. Use NumberFormatter to display a number as a percentage. https://developer.apple.com/documentation/foundation/numberformatter
Or you could make an NSNumber subclass if you want to enforce an arbitrary rule upon numbers. Jonathan > On Jan 13, 2018, at 18:26, Jonathan Hull via swift-evolution > <swift-evolution@swift.org> wrote: > > Hi Evolution, > > I was wondering if we would consider adding a percentage type to Swift. This > would be a type with a value between 0 & 1. > > I know we can and do use doubles or floats for this now, but there really is > a semantic difference between most parameters that take a value between 0 & 1 > and those that take any floating point value. It would be nice to have a > type that semantically means that the value is from 0 to 1. > > It could even just wrap a Double for speed (in my own code I wrap a UInt64 > for decimal accuracy… and to avoid issues around comparisons). > > Thanks, > Jon > _______________________________________________ > swift-evolution mailing list > swift-evolution@swift.org > https://lists.swift.org/mailman/listinfo/swift-evolution
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