Add isOdd factory SDK util

[kjgbot]

Summary

• Add a pure isOdd(n) helper in packages/factory-sdk/src/is-odd.ts
• Add Vitest coverage for odd, even, and zero inputs

Validation

• npx vitest run packages/factory-sdk/src/is-odd.test.ts

Linear: AR-235

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: cf2e063c-1e62-4803-8278-ad4b6150fde7

📥 Commits

Reviewing files that changed from the base of the PR and between de24cb3 and 08c15b7.

📒 Files selected for processing (2)

• packages/factory-sdk/src/is-odd.test.ts
• packages/factory-sdk/src/is-odd.ts

---

📝 Walkthrough

Walkthrough

This PR introduces the isOdd utility function to the factory-sdk package, which determines whether a number is odd by checking the modulo result. The implementation is accompanied by a complete test suite covering odd numbers, even numbers, and zero.

Changes

isOdd utility function

Layer / File(s)	Summary
isOdd function and tests packages/factory-sdk/src/is-odd.ts, packages/factory-sdk/src/is-odd.test.ts	Exports isOdd(n: number): boolean using modulo arithmetic (n % 2 !== 0), with three test cases validating true for 1, false for 2, and false for 0.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 A function so neat, modulo-sweet,
Checking if numbers are odd on their feet!
One test, two, three—the suite looks so keen,
The simplest utility the farm's ever seen. ✨

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely summarizes the main change: adding an isOdd utility function to the factory SDK.
Description check	✅ Passed	The description is directly related to the changeset, providing a clear summary of changes and validation instructions.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ar-235-is-odd

Warning

There were issues while running some tools. Please review the errors and either fix the tool's configuration or disable the tool if it's a critical failure.

🔧 ESLint

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ESLint install failed due to a network error.

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[gemini-code-assist]

Code Review

This pull request introduces a new isOdd utility function and its corresponding unit tests. Feedback on the implementation suggests ensuring the input is a valid integer using Number.isInteger to prevent incorrect results for non-integer values, NaN, and Infinity.

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[gemini-code-assist]

The current implementation of isOdd returns true for non-integer values (such as 1.5), NaN, and Infinity because n % 2 for these values is non-zero (or NaN), which satisfies the !== 0 check. Mathematically, parity is only defined for integers.

To prevent incorrect behavior when non-integers or special number values are passed, we should ensure the input is a valid integer using Number.isInteger(n).

Suggested change

	export function isOdd(n: number): boolean {
	return n % 2 !== 0
	}
	export function isOdd(n: number): boolean {
	return Number.isInteger(n) && n % 2 !== 0
	}

[kjgbot]

Closing per factory close-never-merge policy: synthetic [factory-e2e] probe PR (issue is synthetic; probe PRs are close-never-merge by policy, never merged). Manual enforcement — the daemon's auto-close no-op'd because the PR title lacks the [factory-e2e] marker (close-probe bug, fix in flight).

[agent-relay-code]

Reviewed and fixed PR #277’s current checkout.

Changes made:

• Guarded isOdd with Number.isInteger so fractional, NaN, and infinite values are not treated as odd: is-odd.ts
• Added regression coverage for fractional and non-finite inputs: is-odd.test.ts
• Exported isOdd from the factory SDK entrypoint so the new SDK utility is reachable through the package API: index.ts

Addressed comments

• coderabbitai[bot]: reported no actionable review comments; its ESLint tool had a network install warning, but local npm run lint passed. No code change needed for that comment.
• coderabbitai[bot]: docstring coverage warning in its generated pre-merge notes. No change made: this repo/package does not use JSDoc on comparable exported SDK functions, and repo CI does not enforce that warning.
• gemini-code-assist[bot] review summary: requested integer validation for isOdd; fixed in is-odd.ts, with tests in is-odd.test.ts.
• gemini-code-assist[bot] inline thread on packages/factory-sdk/src/is-odd.ts: same integer-validation issue; fixed in is-odd.ts.
• kjgbot: noted the PR was closed under factory close-never-merge policy. No code change; PR metadata now reports state closed, merged false, mergeable true.

Verification run:

• npm ci
• npx vitest run packages/factory-sdk/src/is-odd.test.ts
• npm run verify:mcp-resources-drift
• npm run lint passed with pre-existing warnings outside the PR files
• npm run typecheck:web
• npm run typecheck:node
• npm test
• npx vitest run
• npm run build
• npm run build:web
• npx playwright install --with-deps chromium
• npx playwright test --config playwright.fidelity.config.ts
• npx playwright test --config playwright.redraw.config.ts

I did not print READY because PR #277 is currently closed/unmerged, so it is not in an open merge-ready state.