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Managing State in Flutter Using BLoC Pattern

Extension Methods

Explore how to extend streams in Flutter using RxDart extension methods. Learn to transform and manage asynchronous data flows with operators such as flatMap, distinctUnique, debounceTime, scan, bufferTest, and doOn methods to create versatile and efficient state management solutions.

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One of the most useful features of RxDart is its extension methods, which allow us to extend the functionality of streams with custom operators. Extension methods are a way to add new methods to existing streams without modifying their source code.

Commonly used extension methods

RxDart provides a wide range of extension methods for working with streams. Here are some of the most commonly used ones.

The flatMap() method

The flatMap() method allows us to transform each item emitted by a source stream into a new stream and then flatten the emissions from those streams into a single stream.

Dart
RangeStream(1, 5)
      .flatMap((value) => Stream.value(value * 2))
      .listen((value) => print(value));

  • Line 1: The RangeStream creates a stream of numbers from 1 to 5.

  • Line 2: The flatMap() operator transforms each number emitted by the source stream into a new stream that emits that number multiplied by 2.

  • Line 3: The listen() method subscribes to the resulting stream and prints each emitted value, which will be 2, 4, 6, 8, and 10. ...

The distinctUnique() method