[swift-evolution] Removing Variadic Parameters.

Saagar Jha saagarjha28 at gmail.com
Wed Jul 6 13:49:02 CDT 2016

On Wed, Jul 6, 2016 at 11:38 AM Tino Heth via swift-evolution <
swift-evolution at swift.org> wrote:

> It's a late answer… but I wanted to be a good citizen and checked if the
> topic has been discussed before; so, it seems that is not the case ;-)
> In short, I agree:
> Variadic parameters are somewhat cool, and I think I was exited when I've
> seen them in C the first time… but I afair, I never created a variadic
> function in production code, and I think I just used them for the first
> time in Swift (I checked wether print is variadic…)
> As of today, string interpolation has several advantages over old-style
> string-formatting, and I can't remember any other method in one of the
> established libraries that uses this feature:
> Explicitly creating an array is just two additional characters, which
> doesn't matter in a long list (which imho shouldn't be crammed into the
> function call anyways), and when there are only a few parameters, you can
> mimic variadics with Optionals defaulted to nil — and who knows what the
> long-awaited hygienic macros might do to the importance of variadic
> parameters.
> Additionally, variadic parameters compete with trailing closures, which
> for me would always win the struggle for the last parameter ;-)

Actually, you don’t have to make a variadic parameter last…print doesn’t.

> As I said, I can't remember a single use case in Swift — and I already
> utilized quite a lot of the "strange" techniques (currying, tuple splat,
> complicated combinations of generics & protocols…).
> So for me, the answer to the question "would I add this feature to Swift
> if it wasn't there?" is a clear no…
> Tino
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-Saagar Jha
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