Dart 3 New Features — Sealed Classes, Pattern Matching, and Records

Dart 3 New Features — Sealed Classes, Pattern Matching, and Records Dart 3 changed how we write Dart. Master the three flagship features with real examples. Records: Return Multiple Values Type-Safely // Before Dart 3: needed a Map or a dedicated class Map String , dynamic > getUser () = > { 'name' : 'Alice' , 'age' : 30 }; // Dart 3: Records are type-safe ( String name , int age ) getUser () = > ( 'Alice' , 30 ); // Named fields ({ String name , int age }) getUserNamed () = > ( name: 'Alice' ,