[swift-evolution] Tuple accessor shorthand

[Félix Cloutier]

To consider: the empty tuple expression is currently legal and represents the void value.

> Le 18 déc. 2015 à 10:30:57, Alexandre Lopoukhine via swift-evolution <swift-evolution at swift.org> a écrit :
> 
> Hello everyone,
> 
> To tie into the discussion of shorthands for “map", here’s something that I think is worth considering:
> 
> Skipping the motivation (mostly, I’m on a mission to eliminate the $ character in my functional code), here’s a function definition:
> 
> func first<A,B>(tuple: (A,B)) -> A {
>    return tuple.0
> }
> 
> Having functions like this transforms
> 
> pairArray.map({$0.0})
> 
> into
> 
> pairArray.map(first)
> 
> This is not ideal, as it pollutes the global space, and there would need to be tons of those for various tuple sizes.
> 
> Here’s an alternative:
> 
> pairArray.map(().0)
> 
> I think that this makes the intent pretty clear, as well as non-conflicting with anything in the language.
> 
> What do you all think?
> 
> — Sasha
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