Mixins
What Are Mixins A Mixin is a code reuse mechanism that lets you share code across unrelated class inheritance hierarchies. Its core purpose is to inject member implementations into classes …
Class Inheritance and Member Overriding
Extend a class Use the extends keyword to create a subclass derived from a superclass. Use the super keyword to access members (methods, constructors, etc.) defined in the superclass from …
Method
A method is a function that provides behaviors for an object, divided into four categories: instance methods, operator overloading, Getters/Setters, and abstract methods. 1. Instance methods 2. Operators Overloading After …
Primary Constructors
Understand the Concept Minimum Dart language version: 3.13. Purpose: Declare fields + primary constructor in one line at the top of the class, drastically reducing boilerplate code. Its runtime behavior …
Constructor
What is a Constructor A constructor is a special function used to create class instances, typically for initializing properties. Except for the default constructor, all constructors share the same name …
Class
What Are Classes and Objects A class is a category, a classification. It abstracts real-world things into a unified type. For example, we abstract all human beings on Earth into …
Libraries
Every Dart file is inherently a library, even without the library directive; Privacy rule: Identifiers starting with underscore _ are library-private, only visible within the current library, inaccessible across files/libraries; …
Metadata
What are metadata annotations Start with @, attach static metadata information to code. They are read by compilers, IDEs and static analyzers and do not affect runtime logic. Two valid …
Function
In Dart, functions are also objects, which differs slightly from other programming languages. Functions are first-class objects Dart is a fully object-oriented language, and functions themselves are objects with the …
exception error handling
All exceptions in Dart are unchecked exceptions. You don’t need to declare thrown types on functions, and catching errors is not mandatory. There are two core categories: Any non-null object …