Add PUT /users/:id to update a user

[8kb]

Summary

• Adds updateUser(id, { name, email }) to db/store.js, mirroring the existing getUserById/createUser style (returns null when the id doesn't match a user).
• Adds PUT /users/:id to routes/users.js: validates name/email are present (400, same pattern as POST /), then 404s if the id doesn't exist, otherwise updates and returns the user (200).
• Adds NOTES.md covering the plan, model choice, commit split, and self-review findings.

What to test

• Valid update: PUT /users/:id with an existing id and both fields → 200 with the updated name/email.
• Unknown id: PUT /users/9999 with both fields → 404.
• Missing field: PUT /users/:id with only name (or only email) → 400, even for an id that exists.

Test plan

• npm test — all 9 tests pass, including tests/update-user.test.js (previously red) and the pre-existing tests/users.test.js / tests/notes.test.js.
• Self-reviewed the diff before pushing — no correctness issues found; one minor, non-blocking validation duplication with POST / noted and left as-is (mirrors existing pattern).

🤖 Generated with Claude Code

https://claude.ai/code/session_016bAMXd9DFUQXzUVESdPZ7e

[mateacademy-ai-mentor]

Review Summary

Your solution is approved. The PUT /users/:id endpoint correctly validates name and email (returning 400 on missing/invalid input), updates via store.updateUser, and returns 404 when the user doesn’t exist, then 200 with the updated user on success. The updateUser implementation follows the established store pattern, returning null when no match is found and mutating the existing user object appropriately. NOTES.md provides a clear plan, model choice, and self-review rationale, meeting the documentation expectations.

Minor suggestion: there’s some duplicated validation logic between POST and PUT; consider extracting a small helper or middleware to DRY this up. Great work aligning with the existing codebase conventions and covering the key behaviors tested.

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