Flyweight
Uses sharing to support large numbers of fine-grained objects efficiently. Reduces memory usage by sharing common parts of state between multiple objects.
Flyweight: Share the Repetitive State
Sharing immutable intrinsic state across thousands of objects to cut memory without changing behavior.
Flyweight in Production: Caches and Runtimes
How JVM string interning, icon caches, and game engines use flyweight at scale.
Advanced Flyweight: Pools, Weak References, and Shared Mutable State
Flyweight beyond pure sharing: pooled flyweights, weak-reference caches, and the hazards of shared mutation.
Flyweight: Review & Mastery Quiz
Scenario questions on state splits, factories, and pools.
Free Books & Guides
Refactoring.Guru — Flyweight
The definitive modern guide to the Flyweight pattern. Clear explanations, UML diagrams, real-world analogies, and code examples in multiple languages.
SourceMaking — Flyweight
A comprehensive companion guide covering the Flyweight pattern with detailed rules of thumb, criticisms, and robust code snippets.
GoF Design Patterns — Flyweight
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 — Flyweight
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 Flyweight
Code examples of the Flyweight pattern in TypeScript, Python, Java, and more.