[swift-users] Why can I not filter or map a dictionary to another dictionary?

[Rick Mann]

> On Oct 26, 2016, at 23:43 , Vincent O'Sullivan via swift-users <swift-users at swift.org> wrote:
> 
> Ah.  Having seen the other answers, I can now see the implied question.
> 
> On 27/10/2016, 07:39, "Vincent O'Sullivan via swift-users" <swift-users-bounces at swift.org on behalf of swift-users at swift.org> wrote:
> 
>    You can.  You just need to get the syntax right:
> 
>    let smallerDictionary = bigDictionary.filter { (key, value) in <some test returning Bool> }
> 
>    let bd = [1:"A", 2:"B", 3:"C"]
>    let sd = bd.filter{(k, v) in
>        k > 1}
>    dump(sd)


In this example, sd is an array of tuples of (key, value), not a dictionary.

> 
>    On 27/10/2016, 01:12, "Rick Mann via swift-users" <swift-users-bounces at swift.org on behalf of swift-users at swift.org> wrote:
> 
>        It seems fairly natural to want to do this:
> 
>        let bigDictionary = ...
>        let smallerDictionary = bigDictionary.filter { key, value in <some test returning Bool> }
> 
>        Similarly, it seems natural to want to map this way.
> 
>        Am I overlooking something?
> 
>        -- 
>        Rick Mann
>        rmann at latencyzero.com
> 
> 
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-- 
Rick Mann
rmann at latencyzero.com