Subclass
A subclass is a class derived from another class that inherits, extends, or specializes its structure or behavior.
Essential TypeScript 5, Third Edition
A subclass is a class derived from another class that can inherit or extend its members and behavior.
- How it is used
- Extends existing classes to add specialized behavior, including persistent storage, collection retrieval, and decorator-added methods.
- How deep it goes
- Works through constructors, protected access, array type inference, and abstract methods; flags the type limitation of decorator-created subclasses.
- Examples
- Uses employee and customer arrays, a JSON-backed to-do collection, an abstract collection, and a decorator that adds serialization.
- What you can do after
- Build it from scratch by extending a class, initializing its superclass, and annotating mixed-subclass arrays when needed.
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The Well-Grounded Python Developer: How the pros use Python and Flask
A child class is a class that inherits attributes or behavior from a parent class.
- How it is used
- Uses inheritance to reduce repeated code and organize related objects into maintainable class hierarchies.
- How deep it goes
- Explains inheritance terminology, syntax, specialization, and a shape hierarchy, but does not catalog advanced inheritance mechanics.
- Examples
- Demonstrates ParentClass, Shape, Rectangle, Square, and Circle through screen-drawing classes and a UML relationship.
- What you can do after
- Build subclass hierarchies in Python that reuse shared initialization and customize class-specific behavior.
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Related concepts
- runtime-generated subclassincludes · A runtime-generated subclass is a subclass created during program execution to represent or extend an entity type dynamically.
- decoratorproduced by · A decorator is a programming-language construct that adds metadata or behavior to, or transforms, a program declaration, often a function or class.
- classkind of · A class is a programming-language construct that defines a type’s structure or behavior and provides a basis for creating or representing objects.
- abstract classkind of · An abstract class is a class intended as a base for subclasses, often not directly instantiable, that can provide shared implementation and declare operations subclasses must implement.
- inheritanceimplements · Inheritance is a mechanism by which a child type or element receives properties, values, or behavior from a parent, subject to system rules and possible overrides.
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