[swift-evolution] [Pitch] Retiring `where` from for-in loops

[Xiaodi Wu]

On Mon, Jun 13, 2016 at 9:28 AM, Sean Heber <sean at fifthace.com> wrote:

> I’m just (probably obtusely) suggesting that there are different levels
> and styles of expression and that the existence of one does not render
> other styles invalid.
>
> In relation to the “where” debate, the fact that you can express
> everything with “guard” or “if” as you can with “where” is not, in my mind,
> a strong  argument against “where” because it ignores other more intangible
> aspects that are going to be a lot harder to quantify since they depend on
> the context of the problem, the surrounding code, the mindset of the
> writer, and the assumed mindset of the reader.
>
> I don’t dispute that we *could* live without “where” - that is not the
> point. We could also live without classes or generics or any of a variety
> of other features - but why should we when we don’t have to?
>

I'm not sure where this comes in. I was clarifying what I mean when I call
a language construct 'expressive.' As I understand the term, `where` is not
expressive, whereas classes and generics are expressive.


>
> l8r
> Sean
>
>
> > On Jun 13, 2016, at 9:19 AM, Xiaodi Wu <xiaodi.wu at gmail.com> wrote:
> >
> > How do you mean? I don't follow.
> > On Mon, Jun 13, 2016 at 09:11 Sean Heber <sean at fifthace.com> wrote:
> > > On Jun 13, 2016, at 9:05 AM, Xiaodi Wu via swift-evolution <
> swift-evolution at swift.org> wrote:
> > >
> > > On Mon, Jun 13, 2016 at 8:58 AM, Charlie Monroe <
> charlie at charliemonroe.net> wrote:
> > > if-continue. But I gladly took upon for-in-where as soon as I found
> out about it since it's more expressive and simply is less typing.
> > >
> > > I don't think we use the term 'expressive' in the same way. I
> understand it to mean that permitting the expression of more things. But of
> course, `where` does only a subset of `guard...continue` or
> `if...continue`; thus, less expressive.
> >
> > The fact that you could simply use the words “I am happy” to express the
> concept of being happy does not mean that writing a complex poem that also
> conveys happiness should therefore be prohibited.
> >
> > l8r
> > Sean
> >
>
>
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