> 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.
--
Brent Royal-Gordon
Architechies
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