What do records, patterns and sealed classes add in Dart 3?

Summary

Records group values without a class and compare by value; patterns destructure data in variable declarations, switch and if-case; sealed classes define a closed set of subtypes so switches over them are checked for exhaustiveness.

Longer Answer

Sealed classes are ideal for UI/state modelling (loading, success, failure).

Key Points

• Records for lightweight tuples.
• Destructuring and switch expressions.
• Exhaustive switches with sealed classes.

Deep dive: Dart Fundamentals: Records and Patterns