Day 31 of #100DaysOfPROSwift. 🔍 Don’t use UUID().uuidString to generate identifiers unless you truly need a string. Instead of this:. 🚫 let id = UUID().uuidString.😬 You lose type safety and introduce fragile string-based comparisons. Do this:. ✅ let id = UUID().Swift’s UUID

Day 26 of #100DaysOfPROSwift. 👁️ Observe property changes with KVO — clean, automatic, and no delegates needed. Instead of this:. 🚫 Manually updating state or using custom delegate.😬 More boilerplate, easy to forget updates. Do this:. ✅ Use @objc dynamic + observe to track

Day 34 of #100DaysOfPROSwift. 🔍 Use enum with associated values to model complex state — cleanly and safely. Instead of this:. var isLoading = false .var errorMessage: String? .var data: Data? . Scattered state, easy to mismanage and misrepresent. Do this:. enum LoadState {

Day 37 of #100DaysOfPROSwift. 🔍 Use zip(_:_:) to iterate over two collections in parallel — cleanly and safely. Instead of this:. for i in 0. <min(names.count, ages.count) { . print("\(names[i]) is \(ages[i]) years old") .} . 😬 Manual index math is error-prone and ugly. Do

Day 35 of #100DaysOfPROSwift. 🔍 Use typealias to simplify complex types and improve readability. Instead of this:. let handler: (Result<Data, NetworkError>) -> Void . Hard to read, especially when reused in multiple places. Do this:. typealias DataResultHandler = (Result<Data,

Day 32 of #100DaysOfPROSwift. 🔍 Prefer using .contains(_:) over manual loops to check for values in collections. Instead of this: .for item in array { . if item == target { . found = true . } .} .😬 Verbose and error-prone — too much boilerplate. Do this:.✅

Day 28 of #100DaysOfPROSwift. 🔁 Use swapAt(_:_:) to swap elements in an array — safely and concisely. Instead of this:. 🚫 Manual temp variables.😬 Verbose and error-prone. Do this:. ✅ array.swapAt(i, j). Swift gives you a built-in method to swap elements directly by index.

Day 39 of #100DaysOfPROSwift. 🔍 Use @autoclosure to delay evaluation of expressions — without changing your function call syntax. Instead of this:. func log(_ message: () -> String) { . if debugMode { print(message()) } .} . log({ "Heavy log: \(expensiveCalculation())" })

Day 38 of #100DaysOfPROSwift. 🔍 Use trailing closure syntax to keep function calls clean and expressive. Instead of this:. let result = { name in . name.uppercased() .}). Cluttered with unnecessary parentheses and syntax. Do this:. let result =

Day 27 of #100DaysOfPROSwift. 🛡 Safely access array elements with a custom subscript. Developers often do this:. 🚫 let item = array[3].😬 Risky — crashes if the index is out of bounds. Do this instead:. extension Array {. subscript(safe index: Int) -> Element? {

Day 40 of #100DaysOfPROSwift. Use guard case let to elegantly unwrap and pattern-match tuples. Instead of this:. if let status = response.status,. let data = . status == .success {. handle(data).} else {. return.}. 😬 Nested if chains get messy

Day 29 of #100DaysOfPROSwift. 🔍 Use Swift’s KeyPath to dynamically access or sort properties — without hardcoding field names. Instead of this:.🚫 users.sorted { $0.name < $1.name }.😬 Repetitive and fragile in generic contexts. Do this:.✅ users.sorted(by: \.name). KeyPaths

Day 36 of #100DaysOfPROSwift. 🔍 Use Dictionary(grouping:by:) to organize items by category — in one line. Instead of this:. var grouped: [String: [User]] = [:] .for user in users { . grouped[user.role, default: []].append(user) .} .😬 Verbose and easy to mess up. Do this:

Day 33 of #100DaysOfPROSwift. 🔍 Use CaseIterable to access all cases of an enum — no manual lists needed. Instead of this:. let allOptions = [.optionA, .optionB, .optionC]. Manual case lists break easily if the enum changes. Do this:. enum Option: CaseIterable {. case a, b, c

Day 30 of #100DaysOfPROSwift. 🔍 Use first(where:) to find the first element in a collection that matches a condition — efficiently and elegantly. Instead of this:. 🚫 Manual loops to check each element.😬 Risk of out-of-bounds errors or verbose code. Do this:. ✅

Day 44 of #100DaysOfPROSwift. Use String(repeating:count:) to quickly generate patterns 🔁. Instead of this:.😬.var dashes = "".for _ in 0. <10 {. dashes += "-".}. Do this:. let dashes = String(repeating: "-", count: 10). ✅ Shorter, clearer, and more efficient. Swift’s.

Day 43 of #100DaysOfPROSwift. Use Swift’s new native Regex for powerful pattern matching 🧠.Instead of this: . let range = text.range(of: "[a-z]+", options: .regularExpression). Do this:. if let match = try? /[a-z]+/.firstMatch(in: text) {. // use match.}. ✅ Native syntax,.

Day 41 of #100DaysOfPROSwift. Use switch with tuples to match multiple conditions at once. Instead of this:. if user.isLoggedIn && user.hasPremium {. showDashboard().} else if user.isLoggedIn {. showUpgradeScreen().} else {. showLogin().}. 😬 Too many chained if conditions.

Day 42 of #100DaysOfPROSwift. Build strings the Swifty way with interpolation 🧩. Instead of this: 😬. let message = "Hello, " + name + "! You have " + String(count) + " new messages.". Do this:. let message = "Hello, \(name)! You have \(count) new messages.". ✅ Safer, cleaner,.

Day 45 of #100DaysOfPROSwift. Super-charge your data processing with concurrent mapping via TaskGroup ⚡️. Instead of this:. 😬 Traditional loop, one network call at a time. var images: [UIImage] = [].for url in urls {. if let img = try? await fetchImage(url) {.