[swift-evolution] Be able to initialise empty dict with array constrcutor

[James Campbell]

So the [Int]() is shorthand for Array<Int>()

On Tue, Jan 5, 2016 at 1:01 PM, Jeremy Pereira <
jeremy.j.pereira at googlemail.com> wrote:

>
> > On 5 Jan 2016, at 12:51, James Campbell <james at supmenow.com> wrote:
> >
> > The problem for me is that is so counter intuitive I didn't even know
> you could do that.
>
> The first one is a bit counter intuitive and I agree that
>
> var distanceCache: [Int: Int] = []
>
> might be an improvement, albeit not one I think many people would agree is
> worth doing. However, the second one is a natural extrapolation from the
> equivalent array syntax i.e.
>
> var array = [Int]()
> var dictionary = [String: Int]()
>
> >
> > On Tue, Jan 5, 2016 at 12:50 PM, Jeremy Pereira <
> jeremy.j.pereira at googlemail.com> wrote:
> > I don’t understand what the problem is
> >
> > > On 5 Jan 2016, at 12:39, James Campbell via swift-evolution <
> swift-evolution at swift.org> wrote:
> > >
> > > See this code:
> > > var distanceCache: [Int: Int] = Dictionary<Int, Int>()
> > >
> > > It is very long and tedious to write especially if what I am storing
> changes.
> > >
> > > I propose we be allowed to do the following:
> > > var distanceCache: [Int: Int] = []
> >
> > You can do
> >
> > var distanceCache: [Int: Int] = [:]
> >
> > Also
> >
> > var distanceCache2 = [Int: Int]()
> >
> >
> > > Perhaps this dictionary syntax is just confusing and it was a bad idea
> to make it the same as an array. Most languages use "{" so why did swift
> choose to share "[" with arrays and dictionaries.
> >
> > It’s not the same, you need the colons inside. I imagine that braces
> were discarded on the grounds that it would confuse the compiler with
> respect to closures, for example
> >
> > var myClosure = {} // is a variable of type () -> ()
> >
> >
> > >
> > > --
> > >  Wizard
> > > james at supmenow.com
> > > +44 7523 279 698
> > >  _______________________________________________
> > > swift-evolution mailing list
> > > swift-evolution at swift.org
> > > https://lists.swift.org/mailman/listinfo/swift-evolution
> >
> >
> >
> >
> > --
> >  Wizard
> > james at supmenow.com
> > +44 7523 279 698
>
>


-- 
 Wizard
james at supmenow.com
+44 7523 279 698
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.swift.org/pipermail/swift-evolution/attachments/20160105/17124eb9/attachment.html>