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

[Jeremy Pereira]

> 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 () -> ()
> 
> 
> >
> > --
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> > james at supmenow.com
> > +44 7523 279 698
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> 
> 
> 
> -- 
>  Wizard
> james at supmenow.com
> +44 7523 279 698