React

1. 1

   React क्या है?

   What React isComponents as functionsVirtual DOM intuitionRendering JSXCreating a Vite app
   25 मिनट
2. 2

   JSX और Components

   JSX syntax rulesSingle root elementClassName vs classEmbedding expressions with {}Defining componentsComposing components
   30 मिनट
3. 3

   Props

   Passing props as attributesReceiving props objectDestructuring props in signatureDefault valuesThinking about prop shapes
   30 मिनट
4. 4

   useState के साथ State

   UseState hookReading stateCalling the setterUpdater function formNever mutate stateCounter pattern
   35 मिनट
5. 5

   इवेंट्स को हैंडल करना

   OnClick handlerOnChange basicsPassing functions vs calling themEvent objectPassing handlers as props
   30 मिनट
6. 6

   सशर्त रेंडरिंग और सूचियाँ

   && for show/hideTernary for either/orMapping arrays to JSXThe key propWhy keys need to be stable
   30 मिनट
7. 7

   Forms और Controlled Inputs

   Controlled input patternValue and onChange togetherMulti-field form stateOnSubmit and preventDefaultGathering form data
   35 मिनट
8. 8

   useEffect के साथ Effects

   What counts as a side effectUseEffect signatureDependency arrayRunning on mount onlyCleanup functionSubscribe/unsubscribe pattern
   40 मिनट
9. 9

   Component कंपोजिशन

   Children propWrapping componentsPassing JSX as propsLifting state upThinking in component trees
   35 मिनट
10. 10

    Context और useContext

    CreateContextContext.ProviderUseContextWhen context is the right toolContext vs prop drilling tradeoffs
    35 मिनट
11. 11

    useReducer

    When to reach for useReducerReducer function shapeAction objectsDispatchCombining useReducer with useContext
    35 मिनट
12. 12

    Custom Hooks

    Extracting stateful logic into a functionUse prefix conventionUseToggle exampleUseLocalStorage exampleHooks rules
    35 मिनट
13. 13

    Performance और Memoization

    React.memo for componentsUseMemo for expensive computationsUseCallback for stable function referencesWhen memoization is overkillMeasuring before optimizing
    35 मिनट
14. 14

    डेटा फ़ेचिंग

    Fetch inside useEffectLoading/error/data statesAbortController cleanupPreventing setState after unmountMention TanStack Query as a next step
    40 मिनट
15. 15

    React Router के साथ रूटिंग

    Installing react-router-domBrowserRouterRoutes and RouteLink for navigationUseParamsUseNavigate
    40 मिनट
16. 16

    React Components का परीक्षण

    Vitest + React Testing Library setupRender and screenGetByRole queriesUserEvent for interactionsWriting one good button test
    40 मिनट
17. 17

    कैपस्टोन: टू-डू ऐप

    Combining state, lists, controlled inputsCustom hook for localStorage persistenceSmall routing setupPutting it together
    60 मिनट

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