30+ Dart Interview Questions And Answers

The event loop is the mechanism that manages the execution order of asynchronous events in Dart. It enables non-blocking execution by managing the event queue and callback functions.

In Dart, a Future is an object that returns a value sometime in the future. A Stream is a sequence of asynchronous events. Both are used to handle asynchronous operations.

Error handling in Streams can be done by providing an onError callback or by using methods such as catchError() on the stream to manage exceptions.

An isolate is a unit of concurrency in Dart. It runs in its own memory space and communicates with other isolates through message passing, ensuring that no memory is shared between isolates.

The Car class is constructed including make, model, and year as parameters. The displayInfo method prints the car's information.

Extension methods allow adding new functionalities to existing classes without changing the class or creating a subclass. Please see the sample code for an example.

extension NumberParsing on String {
  int? toIntOrNull() => int.tryParse(this);
}

You can perform dependency injection in Dart by creating constructor parameters that allow you to pass in dependencies or by setting properties on an object after its creation.

A typedef in Dart allows you to create an alias for a function type or any complex type, making your code more readable and easier to manage.

Tree shaking is a process that removes unused code from your application bundle during the build process, resulting in smaller and more efficient production builds.

To handle platform-specific code in Dart, you can use conditional imports, create a platform channel, or use a package that provides the desired platform-specific implementation.

To use the Greetable mixin, simply include it in a class with the 'with' keyword. The class will now have access to the greet method defined in the mixin.

class Person with Greetable {
  // Person class functionality
}

The cascade notation (..) allows you to perform a sequence of operations on the same object. Please see the code sample for an example.

final car = Car('Toyota', 'Corolla', 2020)
  ..wash()
  ..service();

Abstract classes in Dart serve as a blueprint for other classes. They can contain abstract methods without a body, which must be implemented by any subclass that inherits from it.

Generics allow you to create classes, functions, and lists that work on any data type while still maintaining type safety. They provide flexibility as well as better type checking.

The firstElement function takes a list of any type T and returns the first element of that list.