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Master Design Patterns
in 5 Days

Design patterns are proven solutions to recurring software problems. Learn the patterns that every senior developer knows — with real code examples in JavaScript and Python.

5 lessons
Self-paced
~60 min/day
Free forever
Start Day 1 — Free → See what's covered
What you'll learn

Design Patterns in 5 Days

Design patterns are proven solutions to recurring software problems. Learn the patterns that every senior developer knows — with real code examples in JavaScript and Python.

  • Understand when and why to apply design patterns
  • Implement Singleton, Factory, and Builder patterns
  • Use Observer and Event Emitter for decoupled systems
  • Apply Strategy and Command for flexible behavior
  • Understand MVC and clean architecture
5
practical lessons
23
classic GoF patterns
$0
cost to take this course
SOLID
principles applied
5-Day Curriculum

Every lesson ships working code.
No theory without practice.

01
Creational Patterns: Singleton and Factory
Build a Singleton class that guarantees one instance. Use Factory Method to create objects without coupling to their concrete type.
SingletonFactory MethodAbstract FactoryBuilder
→
02
Structural Patterns: Adapter and Decorator
Use Adapter to make incompatible interfaces work together. Wrap objects with Decorator to add behavior without subclassing.
AdapterDecoratorFacadeProxy
→
03
Behavioral: Observer and Event Emitter
Implement the Observer pattern from scratch, then connect it to Node's EventEmitter. See how React state and Vue's reactivity use this pattern.
ObserverEventEmitterpublish/subscribeReact state
→
04
Strategy and Command
Replace complex conditionals with Strategy pattern. Use Command to turn actions into objects — enabling undo/redo and queuing.
StrategyCommandundo/redoqueue
→
05
MVC and Architecture
Understand Model-View-Controller, how Express and Django implement it, and when clean architecture beats MVC for complex apps.
MVCclean architectureSOLIDdependency inversion
→
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Your instructor
B
Bo Peng
Founder, Precision AI Academy

Kaggle Top 200 data scientist. Trained 400+ professionals across universities and federal agencies. Built production systems used by thousands. This course skips toy examples and gives you patterns that work in real projects.

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