[swift-evolution] [Review] SE-0077 v2: Improved operator declarations

Matthew Johnson matthew at anandabits.com
Thu Jun 30 07:03:53 CDT 2016

Sent from my iPad

> On Jun 30, 2016, at 4:34 AM, Anton Zhilin via swift-evolution <swift-evolution at swift.org> wrote:
> https://github.com/apple/swift-evolution/blob/master/proposals
> /0077-operator-precedence.md
> Idea #1
> There is a high chance that 'higherThan'/'lowerThan' names will be 
> chosen.

What is giving you this idea?  Did I miss some part of the conversation?  I don't recall any indication of what the final keywords will be.

> I still see a problem with that. Keywords in Swift are written 
> in full lowercase, so we should actually take 'higherthan'/'lowerthan'.
> But then what's the point of the preposition? It blends with 
> higher/lower and doesn't actually add any clarity. So we should drop 
> 'than' and have just higher/lower or above/below or succeeds/preceeds or 
> whatever we choose, but *in a single word*.
> Idea #2
> I personally don't like the direction in which the proposal moved (I 
> understand the reasons). Before the first review, consensus seemed to be 
> on this:
> precedence Multiplicative {
>    above Additive
>    below Exponentiative
> }
> And now:
> precedencegroup MultiplicativePrecedence {
>    higherThan: AdditivePrecedence
>    lowerThan: ExponentiativePrecedence
> }

I'm really not sure why you think there is any kind of consensus on this.  I must have missed something.

> Don't you have a feeling that something cute and 'swift' was turned into 
> a monster?
> At least, if we change keywords, we will get this:
> precedence MultiplicativePrecedence {
>    above: AdditivePrecedence
>    below: ExponentiativePrecedence
> }
> I also like in above/below that they are written with the same number of 
> letters, meaning that they will line up nicely.

I agree.  As stated in my review, this is my preference.

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