Currently, Swift doesn't have a way to easily pass a variadic parameter to another variadic function because the variadic parameter itself has already been collected into an array.
There was a prior posting a few weeks back about allowing arrays to be passed to a variadic parameter which would resolve this very specific issue: https://lists.swift.org/pipermail/swift-evolution/Week-of-Mon-20160411/015185.html Unfortunately, that thread devolved into an argument on whether or not variadic parameters should be removed entirely. I, certainly, see merit in having functions that can accept a variable number of arguments and variadic functions should seem intuitive to anyone else that might be reading the code. Swift's documentation presents a very intuitive example: 1. arithmeticMean(1, 2, 3, 4, 5) It's obvious what this function is doing, and any intelligent person would expect 3 as the result. Even WolframAlpha knows how to interpret this: http://www.wolframalpha.com/input/?i=arithmeticMean(1,+2,+3,+4,+5) Moreover, a function can only have ONE variadic parameter, which I think reduces any possible confusion. Regardless, if variadic parameters are going to stay in Swift, then I think they should at least support chaining to another function. The most obvious way of allowing this would be to allow variadic parameters to accept an array. However, I think that if an array (of the parameter type) is specified for a variadic parameter, then no other values should be allowed. This eliminates any unnecessary complexity of potentially having to add values to the array. - Christopher Boyd
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