Flutter × Dart 3 Complete Guide — Pattern Matching, Sealed Classes & Records Dart 3 introduced Pattern Matching, Sealed Classes, and Records — features that fundamentally change how you write Flutter apps. More expressive, safer code with less boilerplate. Dart 3 Key Features Patterns — Destructure and match values Sealed Classes — Exhaustive type checking Records — Lightweight anonymous types Class Modifiers ( final , interface , base , mixin ) Records — Lightweight Composite Types Return multiple values without a dedicated class: // Before: needed a Map or custom class // Dart 3: Records ( String name , int age ) getUser () = > ( 'Kanta' , 28 ); final ( name , age ) = getUser (); print ( ' $name ( $age )' ); // Kanta (28) // Named fields ({ String title , double price , bool inStock }) getProduct () = > ( title: 'Premium Plan' , price: 9.99 , inStock: true ); print ( getProduct () .…