Extract Function Refactoring

Version: 1.0 Added: Jan 21, 2026

Description

Identifies code blocks that can be extracted into reusable functions. Reduces duplication, improves readability, and makes code more maintainable.

Code

Skill Code

Look "keyword">for:
1. Repeated code blocks (3+ lines appearing twice)
2. Long functions (50+ lines)
3. Deeply nested code
4. Code with clear single responsibility
5. Comments explaining "what" (candidate "keyword">for "keyword">function name)

Usage Examples

Examples

User: refactor this long "keyword">function

Claude: I identified 3 extraction opportunities:

1. Lines 15-28: Extract to `validateUserInput()`
2. Lines 45-60: Extract to `formatResponse()`
3. Lines 72-85: Already appears twice, extract to `calculateDiscount()`

Shall I perform these extractions?

Installation

Add the following to your CLAUDE.md file (project root or ~/.claude/CLAUDE.md for global):

CLAUDE.md

# Extract Function Refactoring

Look for:
1. Repeated code blocks (3+ lines appearing twice)
2. Long functions (50+ lines)
3. Deeply nested code
4. Code with clear single responsibility
5. Comments explaining "what" (candidate for function name)

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