PRODUCT DESIGN·7 min

Capacities: connect scattered notes through a project

Capacities is a personal note-taking and knowledge management tool. It organizes meetings, people and projects as connected objects, helping you return from a topic to the records related to it.

Break down the problem and try your own design and implementation first. Then explore the reasoning to check states, edge cases, trade-offs, and ways to test your approach. The guide offers a reasoning path, not a complete implementation.

CODE EXERCISE

Find the notes linked to a project

Write a function that finds notes belonging to a specified project. Each note has a string id and a list of strings named projectIds. All input fields are present.

Input and output: Accept a list of notes and a project ID. Return the matching note IDs. For example, given [{id: "N1", projectIds: ["P1"]}, {id: "N2", projectIds: ["P2", "P1"]}, {id: "N3", projectIds: []}] and project ID "P1", return ["N1", "N2"].
Rules: Match project IDs by exact string equality and keep the input order of the notes. Note IDs are unique. Return [] if nothing matches or the input list is empty.
Deliver: Write the function and check the example, project ID "P3", and an empty note list. Use local data.

Explore the reasoning

For each note, check whether its projectIds contains the target project ID.
Keep the IDs of matching notes in their original order.
Confirm that the example gives N1 and N2, then check the no-match and empty-list results.