I would really like to see something like the following added to the standard
library:
extension Dictionary {
func mapValues<U>(transform:(Key,Value)->U)->[Key:U] {
var output:[Key:U] = [:]
for (k,v) in self {
output[k] = transform(k,v)
}
return output
}
}
It comes up enough that I have had to add it to pretty much every one of my
projects. I also don’t feel comfortable adding it to my frameworks, since I
figure a lot of people are also adding something like this to their projects,
and I don’t want to cause a conflict with their version. Prime candidate for
the standard library.
I like calling it ‘mapValues' as opposed to providing an override for map,
since it makes the specific behavior more clear. I would expect ‘map' to
possibly map the keys as well (though there are issues where the new keys
overlap). I suppose you could just have a bunch of overrides for map if the
compiler becomes good enough at differentiating return types: (Value)->(Value),
(Key,Value)->Value, (Key, Value)->(Key,Value)
Thanks,
Jon_______________________________________________
swift-evolution mailing list
swift-evolution@swift.org
https://lists.swift.org/mailman/listinfo/swift-evolution
