[swift-evolution] [Guidelines, First Argument Labels]: Prepositions inside the parens

[Xiaodi Wu]

I'm having trouble with this example in 3(a):
```
x.loadValues(forKeys: ["fox", "box", "lox"])
```

Based on the preceding discussion, I understand that the above is
preferred by the working group over the following:

```
x.loadValuesFor(keys: ["fox", "box", "lox"])
```

Going by the guidelines, though, it seems like the first option is
also now preferred by the working group over the unlabeled version
below (which admittedly is only an option because 'keys' is not
duplicating type information):

```
x.loadValuesForKeys(["fox", "box", "lox"])
```

Is it really the case that the first option is preferred over the
third? It does look as though it is, based on this in the diff:
```
- func respondWith(data: Data)
+ func respond(withData data: Data)
```

Whichever one is preferred, could the guidelines be clarified in that
respect? Also, what of the guideline not to repeat type information?
For example, why isn't the method above `func respond(with data:
Data)`?


On Tue, Feb 9, 2016 at 1:18 PM, Dave Abrahams via swift-evolution
<swift-evolution at swift.org> wrote:
>
> Hi everybody,
>
> Having looked at some examples, the API guidelines working group members
> that were present this morning agreed we really want prepositions inside
> the parentheses of method calls.
>
> Here are some results for the importer; we're still tuning some of the
> heuristics but overall we feel very good about the preposition
> placement:
>
>   https://github.com/apple/swift-3-api-guidelines-review/commit/da7e512cf75688e6da148dd2a8b27ae9efcb8821?diff=split
>
> Note that this is not final wording, but here are the guidelines we're
> working with for first argument labels:
>
> A. Try to form a grammatical phrase including the first argument and
>    describing the primary semantics at the call site.
>
> B. The first argument gets a label when and only when:
>
>    1. It does not form part of a grammatical phrase describing the
>       primary semantics.  For example,
>       ```
>       x.dismiss(animated: y)
>       ```
>       [more examples needed]
>       Note that parameters with defaults never describe the primary
>       semantics. so are always labeled.
>       ```
>       func invert(options options: SomeOptionSet = []) // yes
>       func invert(_ options: SomeOptionSet = [])       // no
>       ```
>
>    2. The method is a factory method; such calls should mirror
>       initializers, with no preposition.  For example,
>       ```
>       let x = UIColor(red: r, green: g, blue: b)
>       let y = monitor.makeColor(red: r, green: g, blue: b)
>       ```
>
>    3. It is part of a prepositional phrase
>
>      a. The label normally starts with the preposition.
>         For example,
>         ```
>         x.move(from: a, to: b)
>         x.loadValues(forKeys: ["fox", "box", "lox"])
>         ```
>      b. ...unless the preposition would break a very tight association
>         between parameters:
>         ```
>         x.moveTo(x: a, y: b)
>         ```
>         [encourage grouping parameters into higher-level concepts,
>         e.g. Point, in these cases]
>
>
>
> Feedback most welcome, of course.
> --
> -Dave
>
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