Refactoring Courses and Certifications

Refactoring by Leveraging Tests with Scala & ScalaTest

Refactor Scala code with tests by eliminating duplication, shortening methods, reducing parameter lists, moving methods, and extracting classes.

• CodeSignal
• 3 hours
• Self-Paced
• Free Certificate

Refactoring by Leveraging Tests with Kotlin & JUnit

Practice refactoring Kotlin code with tests, applying Extract Method, Parameter Object, Move Method, and Extract Class techniques while preserving behavior.

• CodeSignal
• 3 hours
• Self-Paced
• Free Certificate

Refactoring by Leveraging Your Tests with Go & Testify

Refactor Go code with tests by identifying code smells and applying Extract Method, Parameter Object, Move Method, and Extract Class techniques.

• CodeSignal
• 3 hours
• Self-Paced
• Free Certificate

Career Certificate

Refactoring techniques in C#

Learn safe, incremental C# refactoring techniques for modernizing existing systems while preserving functionality.

• CodeSignal
• 11 hours
• Self-Paced
• Free Certificate
• 4 courses

Career Certificate

Refactoring Techniques in Scala

Learn safe, incremental refactoring techniques for modernizing challenging Scala codebases while preserving functionality.

• CodeSignal
• 11 hours
• Self-Paced
• Free Certificate
• 4 courses

Refactoring with Confidence Using Tests in Ruby & RSpec

Refactor Ruby code with confidence by identifying code smells, applying targeted techniques, and preserving behavior with tests.

• CodeSignal
• 3 hours
• Self-Paced
• Free Certificate

Career Certificate

Refactoring Techniques in C++

Learn safe, incremental C++ refactoring techniques for modernizing challenging codebases while preserving functionality.

• CodeSignal
• 11 hours
• Self-Paced
• Free Certificate
• 4 courses

Refactoring by Leveraging Your Tests with Rust

Refactor Rust code by identifying code smells, simplifying designs, and preserving behavior through existing tests.

• CodeSignal
• 3 hours
• Self-Paced
• Free Certificate

Long-form Refactoring Workshops

Refactor real-life code in long-form workshops: make small changes, run tests, untangle confusing code, and avoid pitfalls like the Flying V complication.

• Laracasts
• 1 hour 34 minutes
• Self-Paced
• Paid Course

Java

Refactoring Java 8 Code with Java 17 New Features - JEP Café Episode 9

Refactor Java 8 kata solutions with Java 17 records, comparing readability improvements and performance.

• YouTube
• 25 minutes
• Self-Paced
• Free Video

JetBrains

Making Sense of Large Java and Kotlin Classes - Understanding and Refactoring Complex Codebases

Learn to understand unfamiliar large classes by tracing behavioral clues, mapping dependencies, and identifying clusters for refactoring.

• YouTube
• 1 hour 38 minutes
• Self-Paced
• Free Video

JetBrains

Refactoring with IntelliJ IDEA

See how adding duplication can make it easier to remove as Bill Wake refactors the Gilded Rose application with tests and IntelliJ IDEA.

• YouTube
• 56 minutes
• Self-Paced
• Free Video

Design Patterns

32 ratings

Apply creational, structural, and behavioural design patterns in Java and UML, use model-view-controller, and refactor code smells in an Android codebase.

• Coursera
• 4 weeks, 4 hours a week
• Self-Paced
• Paid Course

• Best of All Time

Samuel Chan

Python Code Refactoring - Writing Modular Functions

Learn to break a monolithic Python function into smaller, testable functions through a practical refactoring of a Python package.

• YouTube
• 26 minutes
• Self-Paced
• Free Video

Breaking Dependencies to Improve Code

Learn to break tight coupling with traits and dependency injection, using mocks to make order-processing code more testable and easier to change.

• CodeSignal
• 3 hours
• Self-Paced
• Free Certificate