[swift-evolution] [Review #2] SE-0161: Smart KeyPaths: Better Key-Value Coding for Swift

[Rick Mann]

I tend to dislike the backslash as well, but can't suggest a good alternative.

Does any of this allow for operations within the key path? e.g. Department.employees. at sum.salary?

Also, in this example:

let firstFriendsNameKeyPath = \Person.friends[0].name
let firstFriend = luke[keyPath: firstFriendsNameKeyPath] // "Han Solo"

Can't we do without the keyPath: argument name? The compiler knows it's a keypath, it would be nicer to write

let firstFriend = luke[firstFriendsNameKeyPath] // "Han Solo"

> On Apr 5, 2017, at 16:56 , Douglas Gregor via swift-evolution <swift-evolution at swift.org> wrote:
> 
> Hello Swift community,
> 
> The second review of SE-0161 "Smart KeyPaths: Better Key-Value Coding for Swift" begins now and runs through April 9, 2017. The revised proposal is available here:
> 
> https://github.com/apple/swift-evolution/blob/master/proposals/0161-key-paths.md
> The core team’s feedback from the first review of this proposal can be viewed at:
> 
> https://lists.swift.org/pipermail/swift-evolution-announce/2017-April/000342.html
> Reviews are an important part of the Swift evolution process. All reviews should be sent to the swift-evolution mailing list at
> 
> https://lists.swift.org/mailman/listinfo/swift-evolution
> or, if you would like to keep your feedback private, directly to the review manager. When replying, please try to keep the proposal link at the top of the message:
> 
> Proposal link:
> 
> https://github.com/apple/swift-evolution/blob/master/proposals/0161-key-paths.md
> Reply text
> Other replies
> What goes into a review?
> 
> The goal of the review process is to improve the proposal under review through constructive criticism and, eventually, determine the direction of Swift. When writing your review, here are some questions you might want to answer in your review:
> 
> 	• What is your evaluation of the proposal?
> 	• Is the problem being addressed significant enough to warrant a change to Swift?
> 	• Does this proposal fit well with the feel and direction of Swift?
> 	• If you have used other languages or libraries with a similar feature, how do you feel that this proposal compares to those?
> 	• How much effort did you put into your review? A glance, a quick reading, or an in-depth study?
> More information about the Swift evolution process is available at
> 
> https://github.com/apple/swift-evolution/blob/master/process.md
> Thank you,
> 
> -Doug
> 
> Review Manager
> 
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-- 
Rick Mann
rmann at latencyzero.com