.dart File — Dart Source Code

Dart is a client-optimized programming language developed by Google, primarily known as the language behind the Flutter UI framework for building cross-platform mobile, web, and desktop applications from a single codebase. DART files contain source code in a statically-typed, object-oriented language that supports both ahead-of-time (AOT) compilation for production and just-in-time (JIT) compilation for development with hot reload. Dart features sound null safety, async/await for asynchronous programming, generics, mixins, extension methods, and a comprehensive standard library. The language's most significant impact is through Flutter, Google's UI toolkit that has been adopted by companies like Google (Google Pay), BMW, Alibaba, and eBay for building beautiful, natively compiled applications. Dart can also compile to JavaScript for web deployment and to native code for command-line applications. The language includes built-in support for isolates (lightweight concurrent actors), streams for reactive programming, and strong typing with type inference. Dart's package manager (pub) and package repository (pub.dev) provide access to thousands of packages for Flutter and Dart development.