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LET and LAMBDA for Readable Formulas

Structured brief Has example

Name intermediate values and build reusable functions.

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Show me how to use LET and LAMBDA in my spreadsheet. App and version (they may not be available in older versions): [SPREADSHEET_APP_AND_VERSION]. A long formula I want to improve: [PASTE_FORMULA]. Calculations I repeat often: [REPEATED_CALCULATIONS].

Provide:
1. Rewrite my formula with LET: names for repeated parts and intermediate results. Example pattern: =LET(price, B2, qty, C2, subtotal, price*qty, tax, subtotal*Inputs!$B$1, subtotal+tax).
2. Explanation of how names are evaluated, scope, and the benefit (readability and performance when the same calculation is reused).
3. A LAMBDA example for a function I repeat (for instance a commission calculation) with parameters, naming it in the name manager so it can be called like =COMMISSION(B2), and documenting parameters in the description.
4. Helper functions that take LAMBDA (MAP, REDUCE, SCAN, BYROW, BYCOL) with one example each from my context.
5. Testing: how to verify equal results against the original on at least five cases.
6. Compatibility: the fallback for older versions or for people who use other apps, and the risk of sharing files that depend on named functions.
7. Style rules: descriptive names, one idea per name, avoid over-engineering.

Do not change the logic of my formula. Warn me when the workbook will be read by people on older versions.

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Before: =(B2*C2)+(B2*C2)*Inputs!$B$1
After: =LET(price, B2, qty, C2, subtotal, price*qty, tax, subtotal*Inputs!$B$1, subtotal+tax)
Reusable function (name COMMISSION in the name manager): =LAMBDA(sales, rate, MAX(0, sales)*rate) called as =COMMISSION(B2, 0.05).
Helper: =MAP(B2:B10, LAMBDA(x, x*1.2)).
Tests: price 10, qty 3, tax 0.2 returns 36 in both versions. Compatibility: older versions show #NAME?; document the dependency for anyone opening the file. Style rules: descriptive names, one idea per name, and no over-engineering. Verify at least five cases against the original formula before replacing it, and keep a copy of the old formula in a note.

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