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HELLO, WORLD!

Refactoring.Guru makes it easy for you to discover everything you need to know
about refactoring, design patterns, SOLID principles, and other smart
programming topics.

This site shows you the big picture, how all these subjects intersect, work
together, and are still relevant. I don’t pretend to be the inventor of these
concepts—most of them were invented by others during the past 20 years. But I
think that the connection between refactoring, patterns and general programming
principles still remains a mystery for the majority of programmers. This is the
problem I would like to solve here.

P.S. While I update the project constantly, you can already find tons of info on
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REFACTORING

Refactoring is a systematic process of improving code without creating new
functionality. Refactoring transforms a mess into clean code and simple design.

More about Refactoring »


DESIGN PATTERNS

Design Patterns are typical solutions to commonly occurring problems in software
design. They are blueprints that can be taken and customized to solve a
particular design problem in your code.

More about Design Patterns »
 * Premium Content
   * Design Patterns eBook
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 * Refactoring
   * What is Refactoring
     * Clean code
     * Technical debt
     * When to refactor
     * How to refactor
   * Catalog
   * Code Smells
     * Bloaters
       * Long Method
       * Large Class
       * Primitive Obsession
       * Long Parameter List
       * Data Clumps
     * Object-Orientation Abusers
       * Switch Statements
       * Temporary Field
       * Refused Bequest
       * Alternative Classes with Different Interfaces
     * Change Preventers
       * Divergent Change
       * Shotgun Surgery
       * Parallel Inheritance Hierarchies
     * Dispensables
       * Comments
       * Duplicate Code
       * Lazy Class
       * Data Class
       * Dead Code
       * Speculative Generality
     * Couplers
       * Feature Envy
       * Inappropriate Intimacy
       * Message Chains
       * Middle Man
     * Other Smells
       * Incomplete Library Class
   * Refactorings
     * Composing Methods
       * Extract Method
       * Inline Method
       * Extract Variable
       * Inline Temp
       * Replace Temp with Query
       * Split Temporary Variable
       * Remove Assignments to Parameters
       * Replace Method with Method Object
       * Substitute Algorithm
     * Moving Features between Objects
       * Move Method
       * Move Field
       * Extract Class
       * Inline Class
       * Hide Delegate
       * Remove Middle Man
       * Introduce Foreign Method
       * Introduce Local Extension
     * Organizing Data
       * Self Encapsulate Field
       * Replace Data Value with Object
       * Change Value to Reference
       * Change Reference to Value
       * Replace Array with Object
       * Duplicate Observed Data
       * Change Unidirectional Association to Bidirectional
       * Change Bidirectional Association to Unidirectional
       * Replace Magic Number with Symbolic Constant
       * Encapsulate Field
       * Encapsulate Collection
       * Replace Type Code with Class
       * Replace Type Code with Subclasses
       * Replace Type Code with State/Strategy
       * Replace Subclass with Fields
     * Simplifying Conditional Expressions
       * Decompose Conditional
       * Consolidate Conditional Expression
       * Consolidate Duplicate Conditional Fragments
       * Remove Control Flag
       * Replace Nested Conditional with Guard Clauses
       * Replace Conditional with Polymorphism
       * Introduce Null Object
       * Introduce Assertion
     * Simplifying Method Calls
       * Rename Method
       * Add Parameter
       * Remove Parameter
       * Separate Query from Modifier
       * Parameterize Method
       * Replace Parameter with Explicit Methods
       * Preserve Whole Object
       * Replace Parameter with Method Call
       * Introduce Parameter Object
       * Remove Setting Method
       * Hide Method
       * Replace Constructor with Factory Method
       * Replace Error Code with Exception
       * Replace Exception with Test
     * Dealing with Generalization
       * Pull Up Field
       * Pull Up Method
       * Pull Up Constructor Body
       * Push Down Method
       * Push Down Field
       * Extract Subclass
       * Extract Superclass
       * Extract Interface
       * Collapse Hierarchy
       * Form Template Method
       * Replace Inheritance with Delegation
       * Replace Delegation with Inheritance
 * Design Patterns
   * What is a Pattern
     * What's a design pattern?
     * History of patterns
     * Why should I learn patterns?
     * Criticism of patterns
     * Classification of patterns
   * Catalog
   * Creational Patterns
     * Factory Method
     * Abstract Factory
     * Builder
     * Prototype
     * Singleton
   * Structural Patterns
     * Adapter
     * Bridge
     * Composite
     * Decorator
     * Facade
     * Flyweight
     * Proxy
   * Behavioral Patterns
     * Chain of Responsibility
     * Command
     * Iterator
     * Mediator
     * Memento
     * Observer
     * State
     * Strategy
     * Template Method
     * Visitor
   * Code Examples
     * C#
     * C++
     * Go
     * Java
     * PHP
     * Python
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     * Swift
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