140 proposals in 30 minutes

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140 proposals in 30 minutes Jesse Squires jessesquires.com • @jesse_squires • @swiftlybrief

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swift evolution “The Swift evolution process aims to leverage the collective ideas, insights, and experience of the Swift community to improve the Swift development experience.” 1.Engage community 2.Maintain vision and conceptual coherence 3.Core team responsible for strategic direction

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In other words... Turn our* ideas Into Improvements * Anyone can participate!

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Make Swift Great Again

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Swift 1.0 to 3.0 ~2 years of Swift

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How did we get here? Swift 3.0 has arrived! ! But how did that happen? ! Let's analyze swift-evolution proposals! !

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// swift-proposal-analyzer.playground final class Proposal { let title: String let seNumber: String // SE-0001, SE-0002, etc. let authors: [Author] let status: Status // .inReview, .accepted, etc. let fileName: String let fileContents: String let wordCount: Int }

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Proposal metadata What can we learn?

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"It's just metadata" LOL

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Proposals 140

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98 implemented 10 accepted1 10 deferred 19 rejected 3 withdrawn 1 But not yet implemented

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Acceptance: 77% Implementation: 70%

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Word Counts 1191 avg 7300 max 769 median 167 min

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Word / Topic frequency 873 API 384 objective-c 135 bridging 6 swifty Searching the entire proposal corpus

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Authors 78

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100 one author 30 two authors 9 three authors 1 nine authors 1.79 avg per proposal

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Top Authors / Co-authors 25 Erica Sadun 13 Doug Gregor 12 Joe Groff 10 Dave Abrahams 10 Chris Lattner

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How did each release evolve?

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Swift 1.0 to 2.1 no proposals #yatusabes (not open source yet)

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Swift 2.2 8 Proposals implemented

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Swift 3.0 89 Proposals implemented

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11x more !

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1012% increase

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Swift 3.0 1012% more swifty™ Proposals deﬁne and reﬁne what "swifty" means.

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Original Goals » Stable ABI (Application Binary Interface) » Resilience (Fragile binary interface problem) » Portability (Linux) » Type system cleanup and docs » Complete generics » Focus and reﬁne language » API design guidelines

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What actually happened? !

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Swift 3: Nothing compiles lol

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Talking about new iPhone... or Swift 3? ¯\_(ϑ)_/¯

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Overwhelming community participation and feedback! Proposals everywhere

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5 Types of proposals » Syntax refinements » API improvements, redesigns » Bridging with Objective-C » Features (new or refined) » "Bug fixes"

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New Goals » API design guidelines » Automatic application of naming guidelines to imported Objective-C APIs » Adoption of naming guidelines in key APIs » "Swiftiﬁcation" of imported Objective-C APIs » Focus and reﬁne language » Improvements to tooling quality » Source Stability

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very important proposals VIP's

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SE-0005 Better Translation of Objective-C APIs Into Swift Make Cocoa/Objective-C APIs Great Again!™ // Example: let text = "Hello, FrenchKit! !" // Before let content = text.stringByTrimmingCharactersInSet( NSCharacterSet.whitespaceAndNewlineCharacterSet()) // After let content = text.trimming(.whitespaceAndNewlines)

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SE-0023 API Design Guidelines ("The Great API transformation") Make Swift APIs Great Again!™ // Example: var array = [34, 79, 12, 3, 2, 56] // sort in-place (present tense) array.sort() // return new, sorted array (past tense) let sorted = array.sorted()

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SE-0025 Scoped Access Level Make Access Control Specifiers Great Again!™ // Before public > internal > private // (to file) // After public > internal > fileprivate > private // (to scope)

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SE-0117 Allow distinguishing between public access and public overridability Make Subclassing Great Again!™ // Before public class ViewController: UIViewController { } // After open class ViewController: UIViewController { }

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Access control in Swift 3 open public internal ﬁleprivate private

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SE-0069 Mutability and Foundation Value Types Make Foundation Great Again!™ // Before let myDate = Date() let myLaterDate = myDate.dateByAddingTimeInterval(60) // After var myDate = Date() myDate.addTimeInterval(60) // OK let myOtherDate = Date() myOtherDate.addTimeInterval(60) // Error (let constant)

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SE-0065 A New Model for Collections and Indices Make Collections and Indices Great Again!™ // Example: let collection = /* some collection */ var index = collection.index(where: { /* condition */ }) // Before index.successor() // After collection.index(after: index)

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SE-0116 Import Objective-C id as Swift Any type Make Polymorphic Obj-C Interfaces Great Again!™ // Objective-C lol - (BOOL)isEqual:(id)object; // Before func isEqual(_ object: AnyObject?) -> Bool // After func isEqual(_ object: Any?) -> Bool

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The cost of Swift Evolution

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Opportunity Cost what did we give up?

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Was it worth it?

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Yes! Swift 3.0 is much better (but still work to do! !) Source-stable (mostly? !) No more expensive, painful migrations (hopefully !) Better APIs, better Objective-C inter-op ! Community learned about Swift-evolution process !

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Merci!

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Resources Me: @jesse_squires jessesquires.com github.com/jessesquires/swift-proposal-analyzer Swift Weekly Brief: swiftweekly.github.io @swiftlybrief swift-evolution: github.com/apple/swift-evolution