[swift-evolution] Proposal: Remove the space before the colon in compiler-generated [Key : Value] dictionary types

Howard Lovatt howard.lovatt at gmail.com
Thu Jan 14 18:07:48 CST 2016

I am not particularly fussed by the spacing, but I do tend to use a space
either side for dictionaries and for ?: and for the rest no space before.

On Friday, 15 January 2016, David Sweeris via swift-evolution <
swift-evolution at swift.org> wrote:

> I use " : " (space on both sides) for everything except type annotations &
> generic constraints. Didn't realize I was doing it wrong.
> > On Jan 14, 2016, at 11:35, Kevin Ballard via swift-evolution <
> swift-evolution at swift.org <javascript:;>> wrote:
> >
> > Dictionary type shorthand syntax is meant to look like a dictionary
> literal, and dictionary literals are almost universally written with no
> space before the colon. It makes sense to me for dictionary types to be
> written the same way, e.g. `[Key: Value]`. Not only does this look more
> like a dictionary literal, but I'd argue it also reduces confusion. Every
> other case that I can think of where you find space-colon-space syntax used
> is when declaring the bounds of a generic type parameter, or declaring the
> superclass/protocols of a type declaration (which is pretty similar to
> declaring the bounds). But in the syntax `[Key : Value]`, Value is not a
> bound on Key.
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  -- Howard.
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