> On Dec 17, 2016, at 9:43 PM, Mathew Sanders via swift-evolution
> <swift-evolution@swift.org> wrote:
>
> I've just joined the list (hi!) so not sure if this has been discussed in the
> past.
>
> Curious to hear if a future version of Swift might ever include some sort of
> pattern-matching extended to Arrays. Maybe something like the following:
>
> let numbers: [Int]
>
> switch numbers {
> case []:
> // to match an empty array
>
> case [1, 2, 3]:
> // to match array with specific values
>
> case [_, _, _]:
> // to match array with 3 Ints
>
> case let [first, last]:
> // match a 2 element array and bind first and last elements
>
> case let [first, next...]:
> // to match array with at least one element
> // bind first element, and bind other elements (could be empty)
> // first: Int, next: [Int]
> }
>
> I love the pattern matching on tuples, and would love to see if extend to
> Arrays as well, but not sure if it fits with future goals for the language.
Yeah, this is something I've wanted to add for a while, along with pattern
matching for dictionaries, which together with array matching I think would
make a lot of JSON/plist wrangling much more pleasant. Since it's an additive
feature, it's taken a backseat to more pressing source- and ABI-breaking
changes we've wanted to get out of the way first.
-Joe
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