The ‘main()’ function is the entry point of a Dart application. It is where the execution of a Dart program begins. Candidates should be able to explain that any Dart program needs a ‘main()’ function and discuss its role in initializing and running the application.

Dart is considered a good choice for front-end development because it allows for fast compilation to JavaScript, making it suitable for web applications. Additionally, its strong type system and rich libraries enhance developer productivity. Responses should include mentions of performance benefits, ease of learning, and the ability to target multiple platforms from a single codebase.

In Dart, ‘final’ is used to declare a variable that can be set only once. ‘Const’ is used for compile-time constants, meaning the value is determined at compile-time and cannot be changed. Candidates should be able to explain scenarios where each would be used, emphasizing ‘const’ for compile-time constants and ‘final’ for run-time constants.

Dart handles asynchronous programming using async and await keywords, along with Futures and Streams. These tools allow developers to write asynchronous code that is easy to read and maintain. Ideal responses should highlight the practical benefits of async and await, such as improved readability and non-blocking operations.

Dart offers several features that make it suitable for modern app development, such as a rich standard library, strong typing, asynchronous programming, and the ability to compile to JavaScript. Look for candidates who can articulate how these features contribute to efficiency, performance, and developer productivity.

Null safety in Dart helps prevent errors that result from unintentional access to variables that are null. Dart’s null safety feature ensures that values can’t be null unless explicitly allowed. A strong candidate should mention how null safety enhances code reliability and helps in catching potential null errors at compile-time rather than runtime.

Dart is a programming language developed by Google. It is optimized for building mobile, desktop, server, and web applications. One of its primary uses is in developing mobile apps using the Flutter framework. Candidates should demonstrate an understanding of Dart’s versatility and its association with Flutter. Look for mentions of performance, ease of use, and cross-platform capabilities.