All topics
General · Learning hub

Design Patterns notes for developers

Master Design Patterns with a curated set of 3 developer notes — core concepts, patterns, and interview prep. Maintained by the DevRecall team.

Save this stack to your DevRecallMore General notes
Design Patterns

Creational & Structural Patterns

Creational & Structural Patterns Singleton Ensure a class has only one instance and provide a global access point. // Module-level singleton (TypeScript/Node.js…

Design Patterns

Behavioral Patterns

Behavioral Patterns Observer Define a one-to-many dependency so when one object changes state, all dependents are notified. interface Observer<T> { update(data:…

Design Patterns

Interview Questions

Design Patterns Interview Questions Q: What are the three categories of design patterns? Creational — object creation (Singleton, Factory, Abstract Factory, Bui…

From the community

Notes from developers

See all in General →
TypeScriptgeneral

Interview Questions

TypeScript Interview Questions Comprehensive TypeScript interview questions covering type system, generics, utility types, and best practices: Fundamentals 1. What is TypeScript? TypeScript is a typed…

Mar 28, 2026
View
TypeScriptgeneral

Advanced Types (Generics & Utility Types)

TypeScript Advanced Types Generics // Generic function function identity<T>(arg: T): T { return arg; } const num = identity<number>(42); // Explicit const str = identity('hello'); // Inferred // Gener…

Mar 3, 2026
View

Keep your Design Patterns knowledge sharp.

Save this stack to your personal DevRecall — add your own notes, track what you're learning, and share what you know with the community.

Get started — free forever