What are Sealed class in Dart
- A Sealed class in Dart is a particular form of abstract class that limits the subclasses it can have to a predetermined list.
- In Dart, the sealed keyword is user to declare a sealed class.
- You can use the extends keyword to list all the permitted subclasses
- A sealed class serves as a base class that restricts its inheritance hierarchy
- All subclasses of a sealed class must be defined within the same library file
- The compiler statically verifies that all possible cases of a sealed calss are handled, promoting code safety and reducing runtime errors.
SUBCLASSES
- Every subclass needs ti be defined in the same file , or the same library, an example of that is below sealed class CodeMicrosSealed {}class Topic extends CodeMicrosSealed {}class Youtube extends CodeMicrosSealed {}class Subscrive extends CodeMicrosSealed {}
- The Compiler will raise an error if you attempt to define a class in another file that extends the CodemicrosSealed class , check below
Benefits of Sealed Classes:
- Enhanced Type Safety: Ensures that only known subclasses can be instances of a sealed class, preventing unexpected types from being passed around.
- Improved Code Readability: Makes code more explicit and easier to understand by clearly defining all possible states or variations of a sealed class.
- Efficient Pattern Matching: Facilitates the use of the WHEN keyword for exhaustive pattern matching on sealed class instances, leading to more concise and robust code.
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