03 — Behavioral Patterns

3 — Behavioral Patterns

Catalogs Observer, Strategy, State, Command, Chain of Responsibility, Visitor, Iterator, Mediator, Template Method, Interpreter, and Memento — the patterns that govern how objects communicate and share responsibility.

Object-Oriented Programming for MAANG Interviews

A book-shaped table of contents for OOP: paradigm foundations, the four pillars, object relationships, SOLID/GRASP design principles, memory and runtime internals, GoF design patterns, language-specific OOP, and OOP at system scale — cross-linking existing pattern, concurrency, and low-level-design notes instead of duplicating them.

Patterns

A book-shaped table of contents for reusable engineering patterns spanning object-oriented design, enterprise architecture, distributed systems, messaging, APIs, cloud infrastructure, observability, security, concurrency, AI/agentic systems, and organizational design — grounded in production experience at scale.

01 — Creational Patterns

Controlling object instantiation at the composition-root level: Singleton, Factory Method, Abstract Factory, Builder, and Prototype — when each earns its complexity and how they compose in a real dependency graph.

02 — Structural Patterns

Composing objects and classes into larger structures without duplicating behavior: Adapter, Bridge, Composite, Decorator, Facade, Flyweight, and Proxy.

Patterns

A book-shaped table of contents for reusable engineering patterns spanning object-oriented design, enterprise architecture, distributed systems, messaging, APIs, cloud infrastructure, observability, security, concurrency, AI/agentic systems, and organizational design — grounded in production experience at scale.

02 — Pattern Selection & Trade-offs

How to choose between competing patterns under real forces: naming the context, weighing trade-offs and consequences, composing multiple patterns together, and recognizing when a pattern has outlived its fit.