Jens, I see now. I believe this is talked months ago. There is no directly
function at the moment. You can do:
var dict1:[String:String] = ...
var dict2: [User:Product] = [:]
_ = dict1.map {
....
dict2.updateValue(value, forKey:key)
return nil
}
// use dict2
It is ugly, but it works. However, some people thought this was not a good
use of map. And they make an extension of Dictionary themselves.
You can search it in [swift-user], [swift-evolution] if you can't find it
in [swift-user].
Zhaoxin
On Tue, Aug 30, 2016 at 5:52 AM, Jens Alfke <j...@mooseyard.com> wrote:
>
> > On Aug 29, 2016, at 2:07 PM, Zhao Xin <owe...@gmail.com> wrote:
> >
> > I don''t quite understand your question. In Swift, Dictionaries are
> structs. You can always use `let dict2 = dict1`.
>
> I’m talking about a function that does for Dictionaries what map() does
> for Arrays: it transforms every key and value in the input Dictionary
> (through a caller-provided function), producing a new Dictionary.
>
> You could use this to take a dictionary [String:String] that maps user IDs
> to product IDs, and produce a dictionary [User:Product].
> Or you could invert a dictionary (swapping keys and values.)
>
> —Jens
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