React Fundamentals
The React Fundamentals course teaches developers how to build reusable components with JSX, manage props, state, and hooks, and implement event handling, conditional rendering, and forms, delivering interactive UIs efficiently.
Who Should Take This
Front‑end engineers, full‑stack developers, and JavaScript‑savvy programmers who have mastered core language concepts and now want to add React to their toolkit will benefit. They seek practical, hands‑on mastery of component architecture, state management, and performance basics to build production‑ready web applications.
What's Included in AccelaStudy® AI
Adaptive Knowledge Graph
Practice Questions
Lesson Modules
Console Simulator Labs
Exam Tips & Strategy
20 Activity Formats
Course Outline
61 learning goals
1
Components and JSX
3 topics
JSX Syntax and Expressions
- Describe JSX syntax rules including the requirement for a single root element, self-closing tags, and the transformation of JSX to React.createElement calls
- Implement JavaScript expressions within JSX using curly braces for dynamic content rendering including variables, function calls, and ternary operators
- Analyze the differences between HTML attributes and JSX attributes including className, htmlFor, style objects, and camelCase event handler naming conventions
Functional Components
- Describe the structure of a functional component including the function signature, return value, and export patterns for default and named exports
- Implement component composition by nesting child components within parent components and passing data through the component tree
- Evaluate component decomposition strategies to determine when to extract a reusable component versus keeping logic inline based on reuse frequency and complexity
Fragments and Portals
- Implement React Fragments using both the explicit Fragment syntax and the shorthand empty tag syntax to group elements without adding extra DOM nodes
- Describe how React Portals render children into a DOM node outside the parent component hierarchy and identify use cases such as modals and tooltips
2
Props and Data Flow
3 topics
Props Fundamentals
- Describe how props enable unidirectional data flow from parent to child components and explain why props are read-only within the receiving component
- Implement prop passing including strings, numbers, booleans, objects, arrays, and functions as props with destructuring in the component parameter list
- Implement default prop values using default parameter syntax and explain when to use defaultProps versus default parameters
Children Props and Composition
- Implement the children prop pattern to create wrapper and layout components that accept arbitrary nested JSX content
- Implement render props and function-as-children patterns to share stateful logic between components without inheritance
- Analyze the trade-offs between composition patterns including children props, render props, and higher-order components for code reuse scenarios
Prop Validation and TypeScript
- Describe the purpose of prop validation and explain how TypeScript interfaces define component prop contracts for type safety
- Implement TypeScript type annotations for component props including optional props, union types, and callback function signatures
3
State and Hooks
5 topics
useState Hook
- Describe the useState hook signature including the state variable, setter function, and initial value and explain how state updates trigger re-renders
- Implement state management for primitive values, objects, and arrays using useState with proper immutable update patterns including spread syntax
- Implement the functional updater form of setState to handle state updates that depend on the previous state value and explain why it prevents stale closure bugs
- Analyze how React batches multiple state updates within event handlers and evaluate the implications for synchronous state reads after calling setState
useEffect Hook
- Describe the useEffect hook lifecycle including the effect callback, cleanup function, and dependency array and explain when effects run relative to rendering
- Implement useEffect for data fetching, DOM manipulation, and subscription setup with proper cleanup functions to prevent memory leaks
- Analyze dependency array behavior including empty arrays for mount-only effects, specific dependencies for conditional execution, and the risks of missing dependencies
useRef Hook
- Describe the useRef hook and explain how it creates a mutable reference object that persists across renders without triggering re-renders when modified
- Implement useRef for DOM element access including focusing inputs, measuring element dimensions, and integrating with third-party DOM libraries
- Implement useRef to store mutable values such as previous state, interval IDs, and instance variables that should not trigger re-renders when changed
useContext Hook
- Describe the Context API including createContext, Provider components, and the useContext hook for consuming context values without prop drilling
- Implement a context provider with useContext to share global state such as theme settings, authentication status, or locale across deeply nested components
- Evaluate when to use Context versus prop drilling versus external state management and analyze the re-render performance implications of context value changes
Custom Hooks
- Describe the rules of hooks including the requirement to call hooks at the top level and only within React function components or custom hooks
- Implement custom hooks to extract and reuse stateful logic such as useLocalStorage, useDebounce, or useFetch across multiple components
- Analyze the benefits of custom hooks for separation of concerns and evaluate naming conventions and return value patterns for maintainable hook APIs
4
Event Handling and Conditional Rendering
3 topics
Event Handling
- Describe React's synthetic event system and explain how it normalizes browser events across different platforms with consistent event object properties
- Implement event handlers for click, change, submit, and keyboard events with proper event object usage and preventDefault for form submission control
- Implement event handler functions that pass additional arguments using arrow functions or bind and explain the difference between passing a function reference versus calling a function
Conditional Rendering
- Implement conditional rendering using ternary operators, logical AND short-circuit evaluation, and early returns to show or hide UI elements based on state
- Implement loading states, error states, and empty states using conditional rendering patterns to provide appropriate user feedback during async operations
- Analyze the pitfalls of conditional rendering with falsy values such as zero and empty strings and evaluate strategies to prevent unintended rendering of falsy primitives
Lists and Keys
- Implement list rendering using the map method to transform arrays of data into arrays of JSX elements with unique key props for each item
- Describe the purpose of the key prop in list rendering and explain how React uses keys for efficient reconciliation during list updates, insertions, and deletions
- Analyze the consequences of using array indices as keys versus stable unique identifiers and evaluate scenarios where index keys cause incorrect component state preservation
5
Forms and User Input
2 topics
Controlled Components
- Describe the controlled component pattern where form element values are driven by React state and updates flow through onChange handlers
- Implement controlled inputs for text fields, textareas, select dropdowns, and checkboxes with proper state binding and change handler wiring
- Implement multi-field form state management using a single state object with computed property names to reduce handler duplication across form fields
Form Submission and Validation
- Implement form submission handling with onSubmit, preventDefault, and state-based validation logic that displays inline error messages
- Analyze the trade-offs between controlled and uncontrolled components using useRef for form handling and evaluate when each approach is appropriate
6
React Router
2 topics
Route Configuration
- Describe the role of BrowserRouter, Routes, and Route components in defining URL-to-component mappings for single-page application navigation
- Implement route configuration with path parameters, nested routes, index routes, and catch-all routes for a multi-page application layout
- Implement layout routes with Outlet components to share common UI elements like navigation bars and sidebars across multiple route pages
Navigation and Parameters
- Implement client-side navigation using Link and NavLink components with active styling and explain why they are preferred over anchor tags in SPAs
- Implement programmatic navigation using the useNavigate hook for redirect scenarios such as post-form-submission redirects and authentication guards
- Implement useParams and useSearchParams hooks to extract dynamic URL segments and query string parameters for data-driven page rendering
- Analyze route-based code splitting strategies using React.lazy and Suspense to defer loading of route components until they are navigated to
7
Performance Optimization
3 topics
Reconciliation and Virtual DOM
- Describe React's virtual DOM diffing algorithm and explain how reconciliation determines the minimal set of DOM updates needed after a state change
- Analyze how component tree structure affects reconciliation behavior and evaluate why changing component type at the same position destroys and recreates the subtree
Memoization Hooks
- Implement React.memo to prevent unnecessary re-renders of child components when their props have not changed using shallow comparison
- Implement useMemo to memoize expensive computations and prevent recalculation on every render when dependencies have not changed
- Implement useCallback to memoize callback functions and prevent child component re-renders caused by new function references on every parent render
- Analyze the cost-benefit trade-offs of memoization and evaluate when useMemo and useCallback add unnecessary complexity versus providing genuine performance benefits
Lazy Loading and Suspense
- Implement React.lazy for dynamic component imports and wrap lazy-loaded components with Suspense boundaries that display fallback loading UI
- Evaluate code splitting strategies at the route level versus component level and analyze their impact on initial bundle size and user-perceived loading performance
Hands-On Labs
15 labs
~395 min total
Console Simulator
Practice in a simulated cloud console or Python code sandbox — no account needed. Each lab runs entirely in your browser.
Scope
Included Topics
- React 18+ component architecture including functional components, JSX syntax, props, state management with hooks (useState, useEffect, useContext, useRef, useMemo, useCallback), event handling, conditional rendering, list rendering with keys, and controlled/uncontrolled forms
- React Router fundamentals including route configuration, navigation, URL parameters, and nested routes for single-page application navigation patterns
- Basic performance optimization techniques including React.memo, useMemo, useCallback, and understanding React's reconciliation and virtual DOM diffing algorithm
Not Covered
- Next.js, Remix, and other meta-frameworks
- Redux, MobX, Zustand, and external state management libraries
- React Server Components and server-side rendering
- Testing libraries (Jest, React Testing Library, Cypress)
- Class components and legacy lifecycle methods
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