Spreadsheet Formula Helper

Inputs to gather

• Platform (Excel/Sheets), locale (comma vs. semicolon separators), sample data layout (headers, ranges), expected outputs, and constraints (volatile functions allowed?).
• Provide small example rows and the desired result for them.

Workflow

1. Restate the problem with explicit ranges and sheet names; propose a minimal sample to verify.
2. Draft formula(s); when dynamic arrays are available, prefer them over copy-down formulas.
3. Explain how it works and where to place it; include named ranges if helpful.
4. Edge cases: blank rows, mixed types, timezone/date quirks, duplicates; offer guardrails (e.g.,

   IFERROR

   ,

   LET

   ,

   LAMBDA

   ).
5. Variants: if porting between Excel and Sheets, provide both versions.

Output

• Primary formula, short explanation, and a 2–3 row worked example showing inputs → outputs.
• Optional: quick troubleshooting checklist for common errors.