sumif, sumifs, sumproduct

[BrianHung]

Summary

• implement SUMPRODUCT function
• enable SUMIF and SUMIFS in docs
• add tests for SUMIF and SUMPRODUCT

Testing

• cargo test --workspace --lib

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https://chatgpt.com/codex/tasks/task_e_68657274956c83279330f179fe5fc4aa

[BrianHung]

cursor review
make sure there are comprehensive tests for each function, functions are ticked as available, and properly documented with their own page stub

[BrianHung]

Should be its own PR.

[BrianHung]

cursor review
make sure there are comprehensive tests for each function, functions are ticked as available, and properly documented with their own page stub

[BrianHung]

cursor review
make sure there are comprehensive tests for each function, functions are ticked as available, and properly documented with their own page stub

[BrianHung]

cursor review
make sure there are comprehensive tests for each function, functions are ticked as available, and properly documented with their own page stub (page stubs do not have to be created in this commit or PR they just have to exist :))

[cursor]

Bug: Missing Function Documentation Pages

The documentation marks SUMIF and SUMIFS as 'Available' with links to their documentation pages (SUMIF and SUMIFS). However, these linked page stubs are not visible in the provided diff, indicating they may not exist. This violates the requirement that functions must be 'properly documented with their own page stub' that 'just have to exist' to prevent 404 errors, unlike SUMPRODUCT which had its page updated.

docs/src/functions/math-and-trigonometry.md#L85-L88

IronCalc/docs/src/functions/math-and-trigonometry.md

Lines 85 to 88 in b3c2224

	| SUM | <Badge type="tip" text="Available" /> | – |
	| SUMIF | <Badge type="tip" text="Available" /> | [SUMIF](math_and_trigonometry/sumif) |
	| SUMIFS | <Badge type="tip" text="Available" /> | [SUMIFS](math_and_trigonometry/sumifs) |
	| SUMPRODUCT | <Badge type="tip" text="Available" /> | [SUMPRODUCT](math_and_trigonometry/sumproduct) |

Fix in Cursor • Fix in Web

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