And these APIs have to meld with the character of the language. that contains all of the API Design Guidelines. If a word is not contributing to the clarity. So all of the information you need to understand those APIs and how they work is there in the contextual information. correctly translating them into their non-abbreviated forms. noun for the nonmutating method and apply the “form” prefix to And in this bunch of code we actually have verbosity that's not needed in Swift. It's really the APIs you use day in and day out. So, our attempt at using some innocuous word here to describe the argument has actually led us to less clear use cases. REST is independent of any underlying protocol and is not necessarily tied to HTTP. Label tuple members and name closure parameters where they And this code is not clear anymore. So, remove item ted from the list of friends. But the vast majority of times that your API matters, the number of times it's seen, it's going to be in the context, And when you're in that context, you have all. I can't banish a Boolean constant to anywhere. And we see it in actual metrics when we talk about apps. information at the use site. use, they play an important explanatory role. So we use TypeName.Init and provide argument labels in order. Swift API Design Guidelines Swift 3 introduces new API Design Guidelines specifically crafted to the unique character of Swift for clear, concise code. You get to refer to a dotted sequence of property accesses. In 2000, Roy Fielding proposed Representational State Transfer (REST) as an architectural approach to designing web services. elements. And that's every bit as true whether you're writing your API for a million other developers or just for yourself inside your own app. I wouldn't say that. What's that even mean? Before, our global variable, which is painfully global, is now a member. Now Core Graphics has a lot of different global functions to create all different kinds of CG Affine Transforms. is that Swift makes sure that that method exists. They're used all the time to give them these Swifty makeovers to be beautiful in Swift. r/iOSProgramming: A subreddit to share articles, code samples, open source projects and anything else related to iOS, macOS, watchOS, or tvOS … phrase as the base name: In the following, the API author has tried to create grammatical And of course, if the type context is clear, users can even omit the CGColor. That makes it harder to understand. Well, we all know why this API is like this. But for now, let's talk about the guidelines themselves. Because fundamentally these are the same operation. So, we're going to talk about usage first. given position within a collection. Brevity in Swift code, … When the operation is naturally described by a noun, use the People will look at that API in code, or maybe look at the documentation for it a couple of times. /// - **capacityChanged**: `true` iff `capacity` was updated. […] Take extra care with unconstrained polymorphism (e.g. SWIFT Standards works with the user community to specify and publish Market Practice - rules and best-practice advice on how standards should be deployed to meet particular business needs or to comply with regulation. But the fact that this API came from Objective-C. And that implementation detail is leaking out. Collection).. Protocols that describe a capability should be named using the suffixes able, ible, or ing (e.g. It's trying to filter out all of this extra noise, all the things you don't need because they're redundant, to find the actual signal in there. describes a parameter’s role rather than its type. Now, then we're going to talk about the Grand Renaming. can be represented in an Int8. And so we write out a use case. And of course, the Swift use site, it just calls it like a method. That's CGAffineTransformMakeTranslation as well as CGAffineTransformMakeRotation on all of these. Details are never hidden when this page argument labels means the first argument will /// **Inserts** `newHead` at the beginning of `self`. And you can see Swift rendering an opinion about certain things here. Equatable, ProgressReporting).. It tells you how to interweave the words in your code with the surrounding documentation. for common Objective-C idioms such as completion handlers. And it describes the relationship of the argument. Now, let's look at a very related API. with your libraries and your APIs nicely. If we were to omit the word at from the method signature, it could It is a powerful API. mental model. The actual work is being performed on the swift-3-api-guidelines branch of the Swift repository. Compiler validates that these are actually Objective-C properties, gets the right names. Clarity is more important than brevity. But this word child is clarifying the role of this parameter in the operation. result. While this is easy to do for protocols that are stand-alone (SequenceType becomes Sequence), I’m not sure how to update my APIs in which a protocol provides the base for an implementation. Because we have experience from a much larger community. We take a transform. of developers are using, is the right time to reevaluate. Now, we could try adding a typedef to try, So, how will this API look if we were going, Well, we'd probably make a new wrapper type around string. And so between #selector and #keyPath, you can essentially not worry about the Objective-C names. And because the type context is clearer, we can even just say .gregorian. Additionally, we've put in near miss detection. Also, in Swift 3 NSCalendar, it's now just known as Calendar. And underneath that the Swift use site. Notice how the new name better matches the documentation comment. object, name the nonmutating variant using the verb’s present You can look at the generated interface. /// Returns `true` iff `other` is within the area of `self`. when it's being migrated from Swift 2 to Swift 3. * Swift API Design guidelines - "Omit needless words" * e.g. And now notice what the call site looks like here. That is, when the compiler sees myArtist.Name it maps it directly to the corresponding C function without calling any wrappers or intermediaries or overlays. UpperCamelCase. Let's talk a little bit more about naming before we move on. As a Swift programmer, most of the time you don't need to care. And these are cases where in the API it reads well to just have the argument there, insert michael at the start index of friends. Actions. Cocoa and Cocoa Touch APIs. I have two functions here. In all cases, this is a zero cost overhead. that the protocol name is the role, avoid collision by appending To make those uses clear and easy to read distinct Int8 value is converted to a dotted of. Type context is clear, users can use NS Swift name has been around since 2... Effectively terms-of-art, because understanding depends on correctly translating them into their non-abbreviated forms all... The complexity of any underlying protocol and is not a goal in API Design guidelines document do n't right! Not form a semantic family, and it describes the narrowing is recommended with. Convey the correct point in this first argument with no argument label how will this API look we... Meld with the character of the Swift 3 syntax primary responsibility is just to return some value use... With your API Doug outlined 're coming up with first argument find out about! 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