Intermediate

Design Patterns — Level 1

Write code that is easy to change: SOLID, composition, and the 13 everyday design patterns, each refactored from a real problem. In Python or Java.

0.0(0 reviews) 0 students

Created by Ouissem BEN HENIA

Last updated November 2026 Available in

What you'll learn

Spot code smells and measure the cost of change: coupling and cohesion
Apply the SOLID principles and prefer composition over inheritance
Use Factory, Builder and Singleton (and know why to be wary of Singleton)
Use Adapter, Decorator, Facade and Composite to structure code
Use Strategy, Observer, Command, Iterator and Template Method to organise behaviour
Decide when a pattern is worth it and when a plain function is enough, in Python and in Java

Choose your stack

This course adapts to you: pick a track, then one technology per group. The table of contents, your progress and your certificate follow your choice.

Programming language

The concept videos are shared; pick the language of the code videos and the labs.

Recommended before Java Level 2: Building Real Applications

Preview the content for Design Patterns — Level 1 — Python

Videos

Quizzes

Labs

10h 13m

Total time

Course content

6 sections • 95 lessons • 10h 13m total

Why Design Patterns?Preview7m
Quiz · Why Design Patterns?Preview5m

Requirements

Basic object-oriented programming in Python or Java (classes, methods, lists)
No prior knowledge of design patterns

Description

Learn to design code that survives change requests. Each topic starts with a shared concept video: a real change request that hurts, the painful "before" code, the pattern as a class diagram and a step-by-step refactoring, and when the pattern is NOT worth it. Then continue in Python or Java: the same refactoring in real code, the idiomatic version of your language (often just a function in Python), where the standard library already uses it, and the traps. Capstone: refactor the checkout of a small online shop.

Who this course is for

Developers whose code gets harder to change with every feature
Students preparing for interviews or software-design exams
Self-taught programmers who want to write professional, maintainable code

Instructor

Ouissem BEN HENIA

11 courses • 3 students • 0 ★

★ 0.0 · 0 reviews

What you'll learn

Spot code smells and measure the cost of change: coupling and cohesion

Apply the SOLID principles and prefer composition over inheritance

Use Factory, Builder and Singleton (and know why to be wary of Singleton)

Use Adapter, Decorator, Facade and Composite to structure code

Use Strategy, Observer, Command, Iterator and Template Method to organise behaviour

Decide when a pattern is worth it and when a plain function is enough, in Python and in Java

Course content

6 sections • 95 lessons • 10h 13m total

Why Design Patterns?Preview7m
Quiz · Why Design Patterns?Preview5m

Description