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React · module 11 of 15

State Architecture

Choose local, lifted, reducer, context, URL, and server state deliberately instead of storing everything in one component.

Course map
two copies drift apartparentAown stateBown stateA changes; B never hears about it.one source, shared downwardsparentholds the stateApropsBpropsBoth read the same value, so they cannot disagree.Lift only as far as the closest parent that needs it. Pushing everything to the top turns everykeystroke into a re-render of the whole page.
State Architecture — the idea in one picture

What this module covers

5 steps · React

  1. Step 1. Lesson: State Architecture

    Choose local, lifted, reducer, context, URL, and server state deliberately instead of storing everything in one component. Learning objectives - Recognize when state architecture is the right tool. - Explain the role of useReducer, context, state. - Build a small working example before combining it with a larger interface. - Identify one accessibility, maintainability, or error-handling improvement. Read the example, predict what it will do, then complete the small change described in the check question.

    Choose local, lifted, reducer, context, URL, and server state deliberately instead of storing everything in one component. In React, make the state/interaction visible in the UI so completion is easy to verify.

    Check yourself: [React] Use the example to demonstrate state architecture.

  2. Step 2. Quiz: State Architecture

    Check your understanding of State Architecture.

    Reducers centralize related transitions and make complex state behavior explicit. In React, make the state/interaction visible in the UI so completion is easy to verify.

    Check yourself: [React] Complete the knowledge check.

  3. Step 3. Exercise: State Architecture

    Refactor a crowded component into reducer-driven domain state and small presentation components.

    This exercise turns the State Architecture lesson into a working code change. In React, make the state/interaction visible in the UI so completion is easy to verify.

    Check yourself: [React] Does the solution use useReducer and context and state?

  4. Step 4. Review lab: Explain & improve State Architecture

    Rebuild the exercise without copying the solution. Then improve it in two ways: make the code easier to understand and add one useful edge case, responsive behavior, accessibility improvement, or error state. Finally, write a short explanation of how useReducer, context, state work together.

    Rebuilding from memory and improving an edge case turns recognition into durable skill. In React, make the state/interaction visible in the UI so completion is easy to verify.

    Check yourself: [React] Does the improved version still use useReducer, context, state clearly?

  5. Step 5. Mini project: State Architecture

    Build a multi-view task workspace with reducer actions, shared context, URL filters, and persisted preferences.

    The mini project combines the module lesson, quiz, and exercise into one portfolio-ready result. In React, make the state/interaction visible in the UI so completion is easy to verify.

    Check yourself: [React] Does the project apply the module's state architecture skills?

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