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Apple's modern programming language for iOS, macOS, watchOS, and tvOS development. Safe, fast, and expressive.
Apple introduced Swift at WWDC 2014 as a modern replacement for Objective-C, with Chris Lattner leading its initial development. The language combines the performance of compiled systems languages with the approachability of scripting languages, featuring strong type inference, optionals for null safety, value types (structs and enums), and protocol-oriented programming as a first-class paradigm. Swift is the primary language for developing applications across Apple's entire platform ecosystem — iOS, macOS, watchOS, tvOS, and visionOS — and has expanded to server-side development through the Swift on Server ecosystem with frameworks like Vapor and Hummingbird.
Apple open-sourced Swift in 2015, and it runs on Linux and Windows in addition to Apple platforms. SwiftUI, Apple's declarative UI framework introduced in 2019, relies heavily on Swift's advanced type system features including result builders, property wrappers, and opaque return types. The language provides automatic reference counting (ARC) rather than garbage collection, giving developers predictable performance without manual memory management in most cases.
Swift Concurrency, introduced in Swift 5.5, brought structured concurrency with async/await, actors for data isolation, and Sendable checking to prevent data races at compile time. The Swift Package Manager handles dependency resolution, and Xcode provides deep integration for debugging, profiling with Instruments, and Interface Builder. Swift Playgrounds on iPad has also made it a vehicle for programming education.
Swift's protocol-oriented design and value semantics mean that changes to protocol conformances, struct definitions, and enum cases can affect the entire app architecture. Comparing files catches altered optional handling that introduces force-unwrap crashes, modified SwiftUI view hierarchies that break layout, changed actor isolation boundaries that affect concurrency safety, and updated access control modifiers that change API surface.
Teams diff Xcode project files alongside Swift source to catch build setting changes that affect compilation targets.
UtraDiff diffs Swift files using Swift syntax highlighting, covering optionals, closures, protocol conformances, and property wrappers. Side-by-side view aligns struct and class definitions across panels. Inline view compresses SwiftUI view bodies to focus on modifier changes.
The whitespace toggle suppresses Xcode-induced formatting differences. Alt+Arrow navigation jumps between changed declarations, and tokenization separates attribute changes like @Published from computed property logic.
Supported extensions: .swift