[swift-evolution] [SR-933] Rename flatten to flattened

[Howard Lovatt]

I would prefer to change them all: mapped, filtered, flatMapped, reduced,
and flattened.

On Friday, 8 April 2016, David Waite via swift-evolution <
swift-evolution at swift.org> wrote:

> In the sense that these are existing terms of art from functional
> programming, they inherit the meaning of being non-mutating.
>
> If we did consider changing the name of one, I’d prefer if we considered
> all of them at once (so the various bike sheds would be painted in
> complementary colors)
>
> -DW
>
> > On Apr 7, 2016, at 12:12 PM, Dave Abrahams via swift-evolution <
> swift-evolution at swift.org <javascript:;>> wrote:
> >
> >
> > on Thu Apr 07 2016, Arsen Gasparyan <swift-evolution at swift.org
> <javascript:;>> wrote:
> >
> >> Hey guys,
> >>
> >> The 'flatten()' method didn't get the Swift 3 API renaming treatment it
> should
> >> have, to go along with reversed, sorted, joined, etc.
> >> As I see Dmitri Gribenko already agree with it but we still have to
> discuss it
> >> here. So what do you think?
> >>
> >> Implementation: https://github.com/apple/swift/pull/2038
> >
> > I am agnostic on this, but should explain the rationale for the current
> > name. It wasn't overlooked.  We kept flatten as is because it is part of
> > a suite of methods that are terms of art from functional programming
> > (map, filter, flatMap, reduce) that don't follow the naming guidelines
> > but we are nonetheless leaving alone.  The fact that the semantics of
> > flatMap can only be sensibly described in terms of map and flatten
> > reinforces this rationale.
> >
> > If we want to change flatten, we should decide whether this is a
> > principled change, and if so, what the principle is.  If it's a change
> > simply because “flatten() feels weird,” that's OK too, but we should
> > understand what we're doing and why.
> >
> > --
> > Dave
> >
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>
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-- 
-- Howard.
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