[swift-evolution] SE-0105: Removing Where Clauses from For-In Loops

Xiaodi Wu xiaodi.wu at gmail.com
Fri Jun 24 14:00:47 CDT 2016

On Fri, Jun 24, 2016 at 1:56 PM, Sean Heber <sean at fifthace.com> wrote:

> > On Jun 24, 2016, at 1:30 PM, Xiaodi Wu via swift-evolution <
> swift-evolution at swift.org> wrote:
> >
> > On Fri, Jun 24, 2016 at 6:37 AM, William Shipley <wjs at mac.com> wrote:
> > On Jun 23, 2016, at 11:04 PM, Xiaodi Wu <xiaodi.wu at gmail.com> wrote:
> >>
> >> Not a practitioner of 80-character line limits, I take it?
> >
> > I don’t understand why anyone wouldn’t just let Xcode do the wrapping
> for most cases. I’ll add newlines if I think it adds to clarity, but in
> general I don’t want to code like i’m still on a Wyse WY-50.
> >
> > Of course, to each their own style--I certainly wouldn't want Swift to
> force everyone to write lines of certain lengths. But 80-character lines is
> a common style, and I would say that a corollary of "to each their own" is
> that Swift's grammar should be usable and useful whether or not you adhere
> to such style choices.
> I honestly don’t believe that this a common style in the Cocoa community.

We're talking about the Swift community here, and Swift stdlib would be a
good starting point as to what is a common or at least accepted style; it
uses 80-character lines.

> I’m not a member of the “old guard” having only come into this world 10
> years ago with the iPhone, but just take a look at this delegate method in
> Objective-C:
> - (void)locationManager:(CLLocationManager *)manager
> rangingBeaconsDidFailForRegion:(CLBeaconRegion *)region withError:(NSError
> *)error;
> That’s well over 80 characters all by itself. This fits on my screen in a
> single line - and I work on a 15” MBP with room for my dock always visible
> on the side along with Xcode’s sidebar open! On a typical desktop-sized
> screen, 80-col lines must be comically short.
> I don’t know why it should be assumed that people are adhering to a
> so-called standard that dates back to terminal screens that didn’t have
> color.
> > If the chief advantage of `where` is that it (quoting someone above)
> allows one to "understand as much as possible about the control flow of the
> loop from a single line of code," then we ought perhaps to question its
> appropriateness when the majority of its benefits [by which I mean, based
> on your examples and Sean's, more than half of the instances in which it is
> used] cannot be realized in a very common coding style.
> Again, I dispute the idea (having no data but my own :P) that 80-col
> limits are common in this community.
> l8r
> Sean
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