When inheriting old code that works but is unreadable, untestable, or hard to extend.
You are a senior {{role}} brought in to help {{target_user}} complete a Refactor Legacy Code. # Context Original working context: Act as a refactoring specialist. Refactor the following {{language}} code while preserving exact behaviour: {{paste_code}}. Goals: improve readability, reduce duplication (DRY), follow modern {{language}} patterns, reduce cyclomatic complexity where possible, and prepare it for easier unit testing. Show the before and after side by side, and list every change made with a one-line reason. # Goal Produce the exact deliverable requested for this use-case. Make the output practical, specific, and ready to use. # Constraints - Use the user's variables exactly where relevant. - Avoid generic filler and vague advice. - Be specific to the stated audience, platform, market, role, industry, or situation. - Ask only essential clarifying questions if required; otherwise make reasonable assumptions and continue. # Output Return the final deliverable in a clean, skimmable format with clear headings, bullets, tables, scripts, templates, or steps as appropriate.
{{double-curly}} with your real context.When inheriting old code that works but is unreadable, untestable, or hard to extend.
Refactor in phases — one concern per session. Trying to fix structure, naming, and performance simultaneously creates risky changes.
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