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On May 24, 2016, at 12:59 AM, Brent Royal-Gordon via swift-evolution <[email protected]> wrote: >> I have a small remark though, wouldn’t it be better to let transform be of >> type (Key, Value) throws -> T instead of (Value) throws -> T? You can just >> ignore the key (with _) if you don’t need it, but I think it might come in >> handy in some cases. > > The problem is, that closes the door to writing many simple maps in > functional style. For instance, this: > > dictionaryOfNumbers.mapValues(abs) > > Would have to become this: > > dictionaryOfNumbers.mapValues { _, v in abs(v) } > > (It *might* be possible to do it with `$1`, but I'm not sure; there are some > limitations around that.) > > A value-value map is just simpler and cleaner, while almost always giving you > what you need. +1. I don't think I have ever mapped keys. Incidentally, that doesn't have the usual semantics of a map operation as you can produce duplicate keys. > > -- > Brent Royal-Gordon > Architechies > > _______________________________________________ > swift-evolution mailing list > [email protected] > https://lists.swift.org/mailman/listinfo/swift-evolution _______________________________________________ swift-evolution mailing list [email protected] https://lists.swift.org/mailman/listinfo/swift-evolution
