> On Feb 26, 2017, at 8:26 AM, Derrick Ho via swift-evolution
> <swift-evolution@swift.org> wrote:
>
> In swift, a variadic argument can become an array without too much effort.
>
> func foo(_ va: String...) {
> let a: [String] = va
> }
>
> However, it seems odd to me that an array can not be converted into a
> variadic argument
>
> foo(["a", "b", "c"]) // <-error
> foo("a", "b", "c") // no error
>
> Other people have wondered about this too.
> <http://stackoverflow.com/questions/24024376/passing-an-array-to-a-function-with-variable-number-of-args-in-swift>
>
> According to this thread <https://devforums.apple.com/message/970958#970958>
> Doug Gregor says it is due to some type ambiguity. with Generics.
>
> If type ambiguity is the issue, Do we have the option to cast it to the
> correct type?
>
> foo(["a", "b", "c"] as String...) // <- error. doesn't consider String... to
> be a type.
I think this needs to be done with a spread operator in order to disambiguate.
foo(...["a", "b", "c”]
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_operator
<https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_operator>
I like the idea. Its syntactic sugar so I am not sure how open the core team
would be to adding it.
>
> What does the community think? Should we be granted some mechanism to turn an
> array into a variadic argument?
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