[swift-evolution] When to use argument labels, part DEUX

David Hart david at hartbit.com
Fri Feb 5 19:13:14 CST 2016

> Again, I understand the aesthetic preference for this form; I even
> prefer it myself.  On the other hand, it seems to me that the difference
> between the two forms reflects a point of emphasis that isn't crucial to
> understandability at the use-site.  That's why I'm asking whether you
> *can't live with* the results.  Are you merely expressing a strong
> preference, or are you saying the first form is too awful to abide?
>> But I’m not sure how to write a simple rule to explain this reasoning.
> Any *additional* rule is more complexity in the guidelines, which would
> have to pay for itself in some objective terms.  Since (I'm assuming
> you'll agree that) it doesn't make a difference to understandability,
> what objective criteria would you use to justify accomodating cases like
> this?

I’m not an extreme enough person to say that it’s too awful to abide :), but I definitely lie more on that side of the fence than the simple strong preference.

To come back to your other examples, even if I prefer the forms you described in your new thread:

a.dismiss(animated: b)
a.tracksWith(mediaType: b, composer: c)

The alternatives:

a.tracksWithMediaType(b, composer: c)

Shock me much much less than:

a.moveFrom(b, to: c)

That last one is many times less readable to me.

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