[swift-evolution] When to use argument labels (a new approach)

[Jessy Catterwaul]

The last example is more appropriate as a named subscript.

tracks[mediaType: .WaxCylinder, pianist: "Brahms"]


> On Feb 3, 2016, at 5:34 PM, Dave Abrahams via swift-evolution <swift-evolution at swift.org> wrote:
> 
> 
> on Wed Feb 03 2016, Matt Whiteside <swift-evolution at swift.org> wrote:
> 
>> I have one comment (below) about this part:
>> 
>>> On Feb 2, 2016, at 18:59, Paul Cantrell via swift-evolution
>>> <swift-evolution at swift.org> wrote:
>>> 
>>> I have reservations about this. It doesn’t generalize perfectly well:
>>> 
>>> 	a.tracksHavingMediaType("Wax Cylinder”, andPianist: “Brahms”)
>>> 
>>> …strikes me as awkward compared to one of these:
>>> 
>>> 	a.tracksHaving(mediaType: "Wax Cylinder”, pianist: “Brahms”)
>>> 	// or 
>>> 	a.tracksMatchingCriteria(mediaType: "Wax Cylinder”, pianist: “Brahms”)
>>> 	// or even
>>> 	a.tracks(mediaType: "Wax Cylinder”, pianist: “Brahms”)
>>> 
>>> …especially since, in a method of that form, _all_ the arguments are
>>> likely to have a default value of nil:
>>> 
>>> 	a.tracks(mediaType: "Wax Cylinder”)
>>> 	a.tracks(pianist: “Brahms”)
>> 
>> I prefer the original:
>> 
>> a.tracksHavingMediaType("Wax Cylinder", andPianist: "Brahms”)
>> 
>> to any of these,
>> 
>> a.tracksHaving(mediaType: "Wax Cylinder", pianist: "Brahms")
>> // or
>> a.tracksMatchingCriteria(mediaType: "Wax Cylinder", pianist: "Brahms")
>> // or even
>> a.tracks(mediaType: "Wax Cylinder", pianist: "Brahms”)
>> 
>> Because to me, the 3 alternatives, especially the last one, all read
>> more like hashmap accesses than method calls.  In other words, they
>> make it appear as if you are passing in arbitrary keys to be queried,
>> rather than calling one specific method.
> 
> I *think* I understand what you like and why you like it, but I can't
> say I understand your rationale.  To test my understanding, what do you
> think of this:
> 
>      a.tracksHaving(mediaType: "Wax Cylinder", andPianist: "Brahms")
> 
> ?
> 
> Thanks,
> 
> -- 
> -Dave
> 
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