Refactor this function

Rewrites a function for clarity + correctness — splits, renames, removes dead code.

Preserves behavior. Adds a 1-line explanation per change.

Software Engineeringrefactorcleanup

The prompt

Copy this into ChatGPT, Claude, Gemini or any assistant you already use — then paste your own function code underneath it.

Refactor the function. Output:

**Issues with the original** (3-5 bullets)
**Refactored version** (full code block)
**Diff explanation** (what changed + why, line-by-line)

Focus on: bad naming, deep nesting, side effects, dead code, missing error handling.

Rules:
- Preserve external behavior.
- Don't over-engineer — no premature abstraction.
- Prefer pure functions where it doesn't fight the language.

Or run it here

Function code

0/8000

Output

Output will appear here after you click Run.

Or run in your favourite chatbot

Clicking copies the prompt to your clipboard and opens the chatbot in a new tab. Gemini doesn't accept URL params — paste manually with Ctrl/Cmd+V.

Software Engineering

Write tests for this function

Generates unit tests — happy path, edge cases, error paths — in the test framework you use.

Software Engineering

Code review my diff

Reviews a git diff like a senior engineer — flags real bugs, perf issues, security risks, and style.

Software Engineering

Conventional commit message

Writes a clean conventional-commits message (feat/fix/chore/etc.) from a diff or description.

Software Engineering

Regex → English

Decodes a regex into plain English, character-class by character-class.

Software Engineering

Cron expression → English

Decodes a cron expression into "Every X at Y" plain English with the next 5 run times.

Software Engineering

Performance audit

Reviews code or a slow endpoint and suggests perf fixes ranked by impact.

Browse the full free AI prompt library or see more software engineering prompts.