Module 06 Recap
Module 06 covered extracting reusable logic into custom hooks and sharing state across the component tree with the Context API. Here is a summary.
What you learned
Section titled “What you learned”Custom hooks extract stateful logic. A function starting with use that calls React hooks is a custom hook. It encapsulates logic that would otherwise repeat across components or clutter a component body. Each component that calls the hook gets its own state — custom hooks share logic, not state.
Compose hooks. useBudget uses useLocalStorage uses useState. Each layer handles one concern. The outer hook exposes a domain-level API; the inner hooks handle mechanics.
Context broadcasts data without prop drilling. Three parts work together: createContext creates the context, the Provider supplies a value, and useContext subscribes a component. A custom context hook wraps useContext with a guard and a single import point.
Props and context serve different purposes. Props are explicit and composable — use them for identity (which card) and differentiation (what makes this instance unique). Context is for shared state and actions that many components need. Local state is for UI-only values nothing else cares about.
Key terms
Section titled “Key terms”| Term | Meaning |
|---|---|
| Custom hook | A function starting with use that calls React hooks internally |
createContext | Creates a context object that can hold and broadcast a value |
| Provider | A component that wraps a subtree and supplies the context value |
useContext | Hook that subscribes a component to a context value |
| Prop drilling | Passing data through intermediate components that do not use it |
What is next
Section titled “What is next”Module 07 — ZeroBudget Project Build — walks through building the complete ZeroBudget app from scratch, applying every concept from Modules 01–06 in sequence. Each lesson builds one section of the app: income, categories, transactions, the custom hook, and the full context layer.
By the end of Module 07 you will have a complete, deployed, production-quality React app.