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Dart is a modern programming language developed by Google, designed for building high-performance, cross-platform applications. This chapter will take you through Dart's origins, design philosophy, and its wide range of application scenarios in frontend, mobile, and server-side development. !(https://example.com/wp-content/uploads/2026/06/4fe6483e-f830-4ebb-9f0b-12d2608cc6f4.webp) * * * ## Dart's History and Design Goals Dart was born in 2011, with the initial goal of replacing JavaScript as the native scripting language for browsers. Although this goal was not achieved, Dart welcomed a key turning point in 2017—the release of the Flutter framework brought Dart back into developers'Scope. Dart's design goals are very clear: | Design Goal | Description | | --- | --- | | High Performance | Supports AOT (Ahead-of-Time) and JIT (Just-in-Time) compilation, enabling both rapid development and native code generation | | Strong Typing | Supports type inference, balancing type safety and development efficiency | | Cross-Platform | One codebase can be compiled to ARM, x64 machine code, or JavaScript | | Easy to Learn | Syntax draws from Java, JavaScript, C# and other mainstream languages, reducing learning curve | | Null Safety | Built-in Null Safety mechanism to avoid null pointer exceptions at the language level | > Dart 2.0 was released in 2018, marking the language's maturity. Dart 3.0 was released in 2023, further strengthening the type system and pattern matching features. * * * ## Dart's Application Scenarios Dart's application scenarios are very broad, covering full-stack development needs from mobile to server-side. ### Mobile Development (Flutter) This is currently Dart's most core application scenario. Through the Flutter framework, Dart can build native apps for both iOS and Android platforms, running from a single codebase. ### Web Development Dart can be compiled to JavaScript for building web frontend applications. AngularDart is Google's maintained Dart version of the Angular framework, suitable for large web projects. ### Server-side Development Through the dart:io library and frameworks like Shelf, Dart can also write high-performance server-side applications. Google has multiple server-side projects written in Dart internally. ### Command-line Tools Dart can be compiled to standalone executables, making it very suitable for writing cross-platform CLI tools. | Application Scenario | Compilation Target | Typical Frameworks/Tools | | --- | --- | --- | | Mobile | ARM machine code | Flutter | | Web Frontend | JavaScript | AngularDart | | Server-side | Machine code / JIT | Shelf, Dart Frog | | Command-line | Machine code | dart compile exe | * * * ## Dart vs JavaScript Comparison Both Dart and JavaScript are object-oriented languages, but Dart is more rigorous in language design. Below compares the differences between the two from several dimensions: | Comparison Dimension | Dart | JavaScript | | --- | --- | --- | | Type System | Strong typing, supports type inference | Weak typing, dynamic typing | | Null Safety | Built-in Null Safety | None (requires TypeScript or manual checks) | | Entry Function | Must have main() function | Script executes directly | | Classes and Inheritance | Class-based OOP, single inheritance | Prototype chain based | | Compilation Method | AOT + JIT dual mode | Primarily JIT | | Concurrency Model | Isolate (message passing) | Worker threads / Event loop | | Package Management | pub.dev (unified official repository) | npm (community repository) | If you have a JavaScript background, learning Dart will be very easy—their async syntax (async/await) is almost identical. But Dart's type system and null safety mechanism will give you more confidence in large projects. ## Examples Comparison of the same functionality in both languages: // JavaScript Version function greet(name){ if(name ===null|| name ===undefined){ return'Hello, stranger!'; } return `Hello, ${name}!`; } console.log(greet('tutorial')); console.log(greet(null)); // Dart Version——Null safety makes types more explicit String greet(String? name){ // name May be null, needs explicit handling if(name ==null){ return'Hello, stranger!'; } return'Hello, $name!'; } void main(){ print(greet('tutorial')); print(greet(null)); } Hello, tutorial!Hello, stranger! * * * ## The Relationship Between Dart and Flutter Many people first encounter Dart because of Flutter. In fact, Flutter is Dart's "killer application," but Dart itself is an independent general-purpose programming language. There are several reasons why Flutter chose Dart: * JIT compilation supports Hot Reload, allowing sub-second visibility of code changes, greatly improving development efficiency * AOT compilation generates native machine code, with fast app startup and smooth execution, without JavaScript Bridge performance overhead * Dart's declarative UI naturally fits with Flutter's Widget tree structure * Unified tech stack: Google maintains both the language and framework, resulting in good version compatibility > Before learning Flutter, it is recommended to first master Dart basics. After understanding language features, the Flutter learning curve will be much smoother. This tutorial is prepared for this purpose. * * * ## Dart Version Development History | Version | Release Date | Important Features | | --- | --- | --- | | Dart 1.0 | 2013 | First stable release, basic language features | | Dart 2.0 | 2018 | Strong type system, new/const optional | | Dart 2.12 | 2021 | Introduced Null Safety | | Dart 3.0 | 2023 | Pattern matching, Records, class modifiers | This tutorial is written based on Dart 3.x version, and all code examples have been verified in Dart 3.0 and above.