[swift-evolution] [Proposal] Automating Partial Application via Wildcards

[Howard Lovatt]

Much prefer the syntax suggested by Greg that uses {} and $n

On Wednesday, 3 February 2016, Greg Titus via swift-evolution <
swift-evolution at swift.org> wrote:

> What about $N?  :-)
>
> And then you could also put {} around it so that it is more obvious that
> partial1 is being assigned something that acts like a closure, and then you
> end up with:
>
> let partial1 = { projectFunctionToCoordinateSystem(function:
> mySinFunction, p0: p0, p1: p1, x: $0) }
> let partial2 = { projectFunctionToCoordinateSystem(function:
> mySinFunction, p0: .zero, p1: $0, x: $1) }
>
> instead of:
>
> let partial1 = projectFunctionToCoordinateSystem(function: mySinFunction,
> p0: p0, p1: p1, x: _)
> let partial2 = projectFunctionToCoordinateSystem(function: mySinFunction,
> p0: .zero, p1: _, x: _)
>
>
> I’m -1.
>
> With the way that single expression closures work, and the fact that they
> are so syntactically light, I don’t think that this proposal would add
> utility, it would just be one more construct to learn.
>
> - Greg
>
> On Feb 2, 2016, at 10:28 AM, Gwendal Roué via swift-evolution <
> swift-evolution at swift.org
> <javascript:_e(%7B%7D,'cvml','swift-evolution at swift.org');>> wrote:
>
> What about nothing?
>
> let partial1 = f(arg1: 1, arg2:)
>
> Gwendal
>
> Le 2 févr. 2016 à 19:26, Gwendal Roué <gwendal.roue at gmail.com
> <javascript:_e(%7B%7D,'cvml','gwendal.roue at gmail.com');>> a écrit :
>
> Any operator character would be bad, since the function may accept it, as
> in `[1,2,3].reduce(1, combine: *)`
>
> Gwendal
>
> Le 2 févr. 2016 à 19:24, Erica Sadun via swift-evolution <
> swift-evolution at swift.org
> <javascript:_e(%7B%7D,'cvml','swift-evolution at swift.org');>> a écrit :
>
>
> On Feb 2, 2016, at 11:20 AM, Chris Lattner <clattner at apple.com
> <javascript:_e(%7B%7D,'cvml','clattner at apple.com');>> wrote:
>
> On Feb 2, 2016, at 10:16 AM, Erica Sadun <erica at ericasadun.com
> <javascript:_e(%7B%7D,'cvml','erica at ericasadun.com');>> wrote:
>
>
> One superficial comment on this: the use of _ here is a bad idea.  _
> already means something in expressions - “discard”, and a closely related
> thing in declarations - “ignore”.
>
> Adding a third very different thing (placeholder to be filled in later)
> seems like a really confusing thing to do.
>
> -Chris
>
>
>
> #?
>
>
> # means “macro like” or “compiler synthesized”.
>
> -Chris
>
>
> * would be bad, right? And naked ?-marks?
>
> -- E
>
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-- 
  -- Howard.
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