Well, I have found these discussions... It was marked as a bug <https://bugs.swift.org/browse/SR-128> and then directed to swift evolution <https://github.com/ArtSabintsev/swift-evolution/blob/5ef676ec2616465c1cb854f82e3fd4e90b4b09c6/proposals/array-variadic-function.md> .
@jose, the prefix operator you mention looks good, but in the past discussions they wanted a postfix operator so that it would match the declaration. I think I like the postfix operator. func foo(_ a: String...) {} foo(["a", "b", "c"]...) //<- This looks clear. It is turning the array into a variadic argument. However, that thread was closed because it wasn't "discussed" enough prior making the pull request. therefore, if people want it, they got to cast their vote in here by either supporting it or opposing it. I like my original suggestion since it is more explicit. foo(["a", "b", "c"] as String...) On Sun, Feb 26, 2017 at 7:59 PM Jose Cheyo Jimenez <ch...@masters3d.com> wrote: > 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 > > 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? > > _______________________________________________ > swift-evolution mailing list > swift-evolution@swift.org > https://lists.swift.org/mailman/listinfo/swift-evolution > > >
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