![]() To avoid this problem and similar ones, any time Self appeared in a protocol before Swift 5.7 the compiler would simply not allow us to use it in code such as this: let tvShow: = įrom Swift 5.7 onwards, this code is allowed, and now the restrictions are pushed back to situations where you attempt to use the type in a place where Swift must actually enforce its restrictions. In English, that means “you need to be able to accept two instances of the same type and tell me if they are the same.” That might be two integers, two strings, two Booleans, or two of any other type that conforms to Equatable. So, instead the Equatable protocol has a requirement like this: func =(lhs: Self, rhs: Self) -> Bool. Swift could implement this functionality using a function similar to func =(first: Int, second: Int) -> Bool, but that wouldn’t scale well – they would need to write dozens of such functions to handle Booleans, strings, arrays, and so on. For example, Int conforms to Equatable, so when we say 4 = 4 we’re actually running a function that accepts two integers and returns true if they match. In simple terms, this means the following code becomes legal: let firstName: any Equatable = "Paul"Įquatable is a protocol with Self requirements, which means it provides functionality that refers to the specific type that adopts it. SwiftLint and SwiftFormat, in the various stages, play very well together to get a more readable codebase in the project.įeel free to contact me or tweet me on Twitter if you have any additional tips or feedback.Paul Hudson significantly loosens Swift’s ban on using protocols as types when they have Self or associated type requirements, moving to a model where only specific properties or methods are off limits based on what they do. Linting is a common practice when building apps with multiple people. build/release/swiftformat /usr/local/bin/swiftformat fi - name : SwiftFormat run : | swiftformat -version swiftformat. build/release/swiftformat /usr/local/bin/swiftformat fi else git clone -depth 1 -branch $ cd SwiftFormat swift build -disable-sandbox -c release mv. build/release/swiftformat key : $-linting-swiftformat-$ - name : Build nicklockwood/SwiftFormat run : | if then if ! then sudo cp -f. Mint run swiftformat " $' Mintfile)" > $GITHUB_ENV - uses : with : path. ![]() With this, SwiftLint warnings/errors can be detected and fixed while coding.Įcho " Linting project" GIT_DIFF = $(git diff -diff-filter =d -staged -name-only ) while read FILE do # PLACEHOLDER: Xcode project file sorting # see # if ] then # export PATH to find mint export PATH = "/opt/homebrew/bin: $PATH " BEFORE_SWIFTFORMAT_CHECKSUM = $( cat " $FILE " | shasum ) ![]() The following snippet runs SwiftLint on every build, which results in warnings/errors at the corresponding line of code. Here only SwiftLint is run otherwise, SwiftFormat would mess with our code on every build, which would be very annoying. The first stage of linting is within the Build Phases of Xcode. Making Use of It within Xcode Build Phases Otherwise, the version is not locked via Mint. With this, you can easily lock the versions of SwiftLint and SwiftFormat with a file called Mintfile at the root of your project: Mintfile # Source After installing Mint and adding the Mintfile, you need to call SwiftLint and SwiftFormat via mint run swiftlint. To overcome this I found a tool by Yonas Kolb ( GitHub, Twitter) called “Mint”. Which would end up in unnecessarily lint errors on the CI/CD. Additionally, the CI/CD would either use the latest or yet another version of these tools. So the version I am installing and using could be different from the version my peers are using on their machines. The downside of this type of installation is that it doesn’t come with a mechanism for versioning. Adding these files would be sufficient to lint/format your codebase locally after installing SwiftLint and SwiftFormat on your machine. You can find my default configuration files here and here. swiftformat configuration file to the root folder of the project. How to Get Thereįor any new project I am starting or joining (given that there is no other linter/formatter in place), I would introduce a. Most people rely solely on either SwiftLint or SwiftFormat, but I especially like the combination of SwiftLint AND SwiftFormat. For a couple of years, I’ve been utilizing a combination of SwiftLint and SwiftFormat. For this reason, when working with multiple people in one codebase, a linter and/or formatter is inevitable. I admit I like to work in a clean and (consistently) structured codebase.
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