Composite
Composes objects into tree structures to represent part-whole hierarchies. Lets clients treat individual objects and compositions uniformly.
Composite: Trees of Part-Whole
Treating individual objects and groups of objects uniformly.
Composite in Production: UI Trees and Documents
Widget trees, document models, and query trees built as composites.
Advanced Composite: ASTs and Interpreters
Syntax trees, expression evaluators, and composite-backed interpreters.
Composite: Review & Mastery Quiz
Scenario questions on part-whole trees, traversal, and ASTs.
Free Books & Guides
Refactoring.Guru — Composite
The definitive modern guide to the Composite pattern. Clear explanations, UML diagrams, real-world analogies, and code examples in multiple languages.
SourceMaking — Composite
A comprehensive companion guide covering the Composite pattern with detailed rules of thumb, criticisms, and robust code snippets.
GoF Design Patterns — Composite
The original Gang of Four book describing the pattern. Available in the "Design Patterns: Elements of Reusable Object-Oriented Software" on Wikipedia.
Official Documentation
Video Courses
freeCodeCamp — Design Patterns Course
A comprehensive multi-hour video course covering all major design patterns with implementations in JavaScript and TypeScript.
Design Patterns in Modern JavaScript Playlist
YouTube playlist covering creational, structural, and behavioral patterns with clear code walkthroughs.
Web Dev Simplified — Composite
Clear, concise video tutorials covering design patterns with practical examples.
Practice & Examples
Awesome Low-Level Design (GitHub)
A curated collection of free LLD resources, pattern implementations, and interview problems across multiple languages.
Design Patterns Implementation (GitHub)
The most popular open-source collection of design pattern implementations with detailed explanations.
Refactoring.Guru Examples in Composite
Code examples of the Composite pattern in TypeScript, Python, Java, and more.