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Refactoring Code

Forge assists with code refactoring, helping you improve code quality, modernize legacy code, and maintain clean architecture principles.

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Basic Refactoring

Request refactoring for any piece of code: 
> Help me refactor this class-based component to use React Hooks
Forge will:
  • Analyze the existing code structure
  • Propose a modernized version
  • Explain the changes and benefits
  • Implement the refactoring with your approval
Forge can help modernize your codebase by walking you through refactoring steps and implementing them with your approval.

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Refactoring Workflows

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Step-by-Step Refactoring

1

Identify refactoring needs

Point out code that needs improvement:
> This function is too complex and hard to test. How should I refactor it?
2

Review suggestions

Forge will suggest refactoring approaches, such as:
  • Breaking down large functions
  • Extracting reusable components
  • Applying design patterns
  • Improving naming and structure
3

Implement changes

Approve the refactoring plan and let Forge implement it incrementally.
4

Verify behavior

Test that functionality remains unchanged after refactoring.

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Large-Scale Refactoring

For significant architectural changes:
1

Define the goal

> I want to refactor our monolithic application into a modular architecture
2

Get a refactoring plan

Forge will analyze your codebase and propose a step-by-step migration plan.
3

Implement incrementally

Work through the plan one module at a time, ensuring tests pass at each step.
For large refactorings, always work in small, testable increments. Forge can help you break down the work into manageable chunks.

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Common Refactoring Patterns

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Modernizing Legacy Code

Update old code to use current best practices: 
> Modernize this ES5 JavaScript code to use ES6+ features
Forge will convert:
  • var to const/let
  • Callbacks to Promises/async-await
  • function to arrow functions where appropriate
  • String concatenation to template literals

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Improving Code Structure

Enhance organization and maintainability: 
> This file has grown to 1000+ lines. How should I organize it better?
Forge suggests:
  • Extracting functions or classes into separate files
  • Creating logical modules or components
  • Applying separation of concerns
  • Organizing imports and dependencies

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Simplifying Complex Logic

Make code more readable and maintainable: 
> Simplify this nested conditional logic
Forge can:
  • Flatten nested conditions using early returns
  • Extract complex conditions into named functions
  • Apply guard clauses
  • Use lookup tables or strategy patterns

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Real-World Refactoring Scenarios

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Scenario 1: Converting Class Components to Hooks

Before: Class-based React component with lifecycle methods
1

Request conversion

> Convert this class component to a functional component with hooks
2

Review changes

Forge converts:
  • componentDidMount → useEffect
  • this.state → useState
  • this.props → function parameters
  • Class methods → function definitions
3

Test thoroughly

Verify all functionality works as expected with the new structure.

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Scenario 2: Extracting Reusable Logic

Problem: Duplicated code across multiple files 
> I have similar data fetching logic in 5 different components. Help me extract it into a reusable hook/utility.
Forge will:
  • Identify the common patterns
  • Create a shared utility or custom hook
  • Update all instances to use the extracted logic
  • Ensure error handling and edge cases are covered

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Scenario 3: Applying Design Patterns

Problem: Code is hard to extend and maintain 
> This switch statement handles 10 different cases and keeps growing. What pattern should I use?
Forge suggests:
  • Strategy pattern with polymorphism
  • Command pattern for encapsulating actions
  • Factory pattern for object creation
  • Implements the chosen pattern with explanation

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Database Schema Refactoring

Forge can help design and refactor database schemas: 
> I need to design a database schema for a blog with users, posts, comments, and categories
Forge will:
  • Suggest appropriate schema design
  • Define tables/collections with proper types
  • Recommend relationships and foreign keys
  • Suggest indexes for performance
  • Consider your existing database technology
When refactoring database schemas, Forge can help you plan migration strategies that minimize downtime.

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Refactoring for Performance

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Optimizing Algorithms

> This sorting function is slow with large datasets. How can I optimize it?
Forge analyzes:
  • Current algorithm complexity (O(n²), O(n log n), etc.)
  • More efficient algorithms for your use case
  • Memory vs. speed trade-offs
  • Built-in optimized alternatives

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Reducing Redundancy

> I'm making multiple API calls when one would suffice. Help me refactor this.
Forge helps:
  • Batch related API calls
  • Implement caching strategies
  • Use GraphQL for efficient data fetching
  • Add proper memoization

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Refactoring for Testability

Make code easier to test through refactoring: 
> This function is hard to test because it has many dependencies. How should I refactor it?
Forge suggests:
  • Dependency injection patterns
  • Breaking functions into smaller, pure functions
  • Extracting side effects
  • Using interfaces for better mocking
1

Identify testing pain points

Explain what makes the code hard to test.
2

Apply testability patterns

Forge refactors using dependency injection, pure functions, and clear interfaces.
3

Write tests

With improved structure, writing tests becomes straightforward.

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Type Safety Refactoring

Add or improve type safety in your code: 
> Add TypeScript types to this JavaScript module
Forge will:
  • Analyze existing code to infer types
  • Add appropriate type annotations
  • Use generics where beneficial
  • Create type definitions for complex objects
  • Suggest stricter type checking options

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Architecture Refactoring

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Service Layer Pattern

Refactor to follow clean architecture principles: 
> Help me separate business logic from API routes
Forge implements service layer patterns:
  • Extract business logic into service classes
  • Keep controllers thin
  • Define clear interfaces
  • Apply dependency injection

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Module Organization

> Reorganize this codebase into logical modules
Forge suggests structure based on:
  • Domain-driven design principles
  • Feature-based organization
  • Layered architecture (presentation, business, data)
  • Microservices boundaries (if applicable)

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Best Practices for Refactoring

  1. Test first: Ensure you have tests before refactoring
  2. Small steps: Refactor incrementally, not all at once
  3. Preserve behavior: Functionality should remain unchanged
  4. Commit frequently: Create checkpoints you can return to
  5. Review changes: Ask Forge to review refactored code
  6. Document reasons: Note why refactoring was needed
When doing large refactorings, create a new branch and commit after each successful step. This makes it easier to track progress and roll back if needed.

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Refactoring Checklist

Before starting a refactoring:
  • Tests exist and pass for current functionality
  • You understand why the refactoring is needed
  • You have a clear goal for the refactored code
  • Changes can be made incrementally
  • You’ve created a backup/branch
After refactoring:
  • All tests still pass
  • Code is more readable and maintainable
  • Performance is improved or unchanged
  • Documentation is updated
  • Team members can review the changes

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Common Refactoring Commands

TaskExample Prompt
Simplify logicSimplify this complex function
Extract codeExtract this repeated code into a utility
ModernizeUpdate this to use modern JavaScript
Improve structureBetter organize this large file
Add typesAdd TypeScript types to this module
Design patternApply a better pattern to this code

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Integration with Testing

Refactoring and testing go hand-in-hand: 
> Refactor this function and add unit tests for it
Forge will:
  1. Refactor the code for better structure
  2. Make it more testable
  3. Write comprehensive unit tests
  4. Ensure tests cover edge cases
See the Testing guide for more details on writing tests with Forge.

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Next Steps

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