Accenture Software Engineer React JS Interview Questions

Accenture Software Engineer React JS Interview Questions

On December 30, 2024, Posted by CRS Info Solutions , In Reactjs, With Comments Off

Fundamentals of React JS
State and Props Management
React Hooks
Advanced React Concepts
React Router and Navigation
State Management (Redux/Context API)

When preparing for an Accenture Software Engineer React JS interview, I know how crucial it is to master React JS fundamentals and apply them effectively in complex scenarios. Accenture doesn’t just focus on theoretical knowledge—they dive deep into your ability to solve real-world problems using React hooks, lifecycle methods, and state management tools like Redux. Additionally, questions on JavaScript ES6+, TypeScript, and integration with Node.js and REST APIs are common. In this guide, I’ve gathered key questions and insights that will help you confidently face the technical rounds and tackle the challenges head-on.

This content is designed to sharpen your skills and ensure you’re fully prepared for an Accenture React JS interview. With focused questions covering everything from basic to advanced React JS topics, you’ll be ready to demonstrate both your technical expertise and problem-solving ability. Plus, knowing the average salary for a Software Engineer at Accenture specializing in React JS ranges between $85,000 to $120,000 annually gives me the motivation to aim higher and excel. Dive into this guide and equip yourself for success in your next interview!

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<<< Fundamentals of React JS >>>

1. What is the virtual DOM in React, and how does it improve performance?

The virtual DOM in React is essentially an in-memory representation of the real DOM elements that exist in the browser. When I make any changes in my React components, such as updating the state, React first updates this virtual DOM instead of manipulating the real DOM directly. React then compares the virtual DOM with the actual DOM through a process called reconciliation. By identifying the differences (known as “diffing”), it updates only the parts of the actual DOM that need to change. This selective update process is much faster than re-rendering the entire DOM, which is why the virtual DOM improves performance.

This approach is particularly useful in large-scale applications where multiple components need to be updated frequently. Instead of constantly updating the real DOM, which can be slow and resource-intensive, React optimizes these operations using the virtual DOM. By doing this, it reduces the number of operations that manipulate the actual DOM, resulting in faster and more responsive applications. So, whenever I need to enhance performance in my application, I know React’s virtual DOM is working behind the scenes to ensure optimal efficiency.

2. How do you create a React component, and what are the differences between class and functional components?

Creating a React component can be done in two primary ways: using class components or functional components. In a class component, I define the component as a JavaScript class that extends from React.Component. It includes a render method that returns the JSX to be displayed.

Here’s a simple example:

class Welcome extends React.Component {
  render() {
    return <h1>Hello, {this.props.name}</h1>;
  }
}

On the other hand, functional components are simpler and defined as JavaScript functions. They don’t require extending any class, and I can directly return the JSX from the function. For instance:

function Welcome(props) {
  return <h1>Hello, {props.name}</h1>;
}

One key difference between the two is that class components can have internal state and lifecycle methods, while functional components used to be stateless until React introduced hooks. Now, with hooks like useState and useEffect, I can manage state and lifecycle events in functional components as well, making them more versatile and preferred in modern React development.

3. Explain the purpose of keys in React. Why are they important in lists?

In React, keys serve as a unique identifier for each element in a list. Whenever I render a list of items, React uses these keys to keep track of which items have changed, added, or removed. The main reason keys are so important is because they help React optimize the rendering process. Without keys, React would have to re-render every item in the list, even if only one or two items have changed.

When I use keys, React can intelligently update only the elements that are necessary, ensuring better performance. For example, if I render a list of users:

const users = ['Alice', 'Bob', 'Charlie'];
return (
  <ul>
    {users.map(user => <li key={user}>{user}</li>)}
  </ul>
);

In this example, each user in the list has a unique key. This tells React which elements should be updated when the list changes. If I forget to include keys or use non-unique values, React may not behave as expected, and I could experience performance issues or unexpected bugs in the UI.

4. What is JSX in React, and how does it differ from traditional JavaScript?

JSX stands for JavaScript XML, and it’s a syntax extension for JavaScript that allows me to write HTML-like code inside my JavaScript files. Instead of using React.createElement() to create elements manually, JSX simplifies the process by allowing me to write something that looks very similar to HTML:

const element = <h1>Hello, world!</h1>;

Although it looks like HTML, JSX is actually converted to JavaScript behind the scenes. One major difference between JSX and traditional JavaScript is that JSX enables me to write elements and components in a declarative way, directly within my JavaScript logic. This makes the code more readable and easier to maintain, especially when building complex UI structures.

Another important thing to note is that JSX allows me to embed JavaScript expressions within curly braces {}. For example, I can include variables or expressions inside JSX:

const user = 'John';
const element = <h1>Hello, {user}!</h1>;

In traditional JavaScript, this kind of templating would require concatenation or separate DOM manipulation. With JSX, React streamlines the process, making it much more intuitive to integrate logic directly into the UI.

5. How does React’s reconciliation process work when updating the DOM?

The reconciliation process in React is a method that allows React to efficiently update the DOM by comparing the virtual DOM with the previous version. React uses a diffing algorithm to detect changes in the component tree, which helps it determine the minimal set of updates required. Instead of re-rendering the entire DOM, React performs this comparison and only updates the nodes that have actually changed.

This process starts when I make a change in my component’s state or props, triggering React to create a new virtual DOM. React then compares this new virtual DOM with the previous version using a technique called diffing. By comparing the old and new versions, React identifies which parts of the DOM need to be updated. For example, if only one child component has changed, React will only update that part of the DOM instead of re-rendering the whole page.

The reconciliation process is crucial for maintaining performance in large, dynamic applications. By minimizing the number of DOM manipulations, React ensures that my app stays fast and responsive, even when dealing with complex interfaces or frequent updates. This is one of the key reasons React is considered highly efficient compared to other UI libraries or frameworks.

<<< State and Props Management >>>

6. What is the difference between state and props in React, and how do they interact with each other?

In React, both state and props are used to manage data in components, but they serve different purposes. State is an internal data structure, specific to a component, that can change over time. It is managed within the component itself using the useState hook in functional components or this.setState in class components. On the other hand, props are external data passed from one component to another, typically from a parent to a child. Unlike state, props are immutable, meaning they cannot be changed by the component receiving them.

The interaction between state and props is essential in React. For example, a parent component can store data in its state and then pass it down as props to its child components. The child components can access this data and use it for rendering, but they cannot modify it. If a child needs to modify the state, it would trigger an event or callback function passed as a prop from the parent, which in turn updates the state in the parent. This interaction maintains the flow of data in a React application, ensuring that changes are handled predictably and consistently.

7. How can you manage the state in a complex React application with multiple components?

Managing state in a complex React application can be challenging, especially when multiple components need access to shared state. In such cases, I often rely on global state management solutions like Redux or Context API. Redux allows me to centralize the state in a single store, making it accessible to any component in the application. I can then use actions and reducers to modify the state in a predictable way. This approach works well in large applications where state needs to be shared across different levels of the component hierarchy.

Another approach is the Context API, which is built into React and is useful for managing state that needs to be shared among multiple components without the need for prop drilling. I can create a context that holds the state and use the useContext hook in any component that needs to access or modify it. While Context API is simpler for medium-sized applications, Redux offers more flexibility and scalability for larger, more complex projects. I typically choose the solution based on the size and requirements of the application.

8. Explain how lifting state works in React, and provide an example where it’s necessary.

Lifting state in React refers to the process of moving shared state up to a common ancestor component so that multiple child components can access and modify the state. This is necessary when two or more components need to communicate with each other or share the same data. Instead of maintaining separate states in each child, the state is “lifted” to their parent, allowing them to access the same data via props.

For example, imagine I have two sibling components: one that allows the user to input a value, and another that displays that value. To synchronize them, I would lift the state up to their parent component. Here’s a simple example:

function Parent() {
  const [value, setValue] = useState("");

  return (
    <div>
      <InputComponent value={value} setValue={setValue} />
      <DisplayComponent value={value} />
    </div>
  );
}

function InputComponent({ value, setValue }) {
  return (
    <input type="text" value={value} onChange={(e) => setValue(e.target.value)} />
  );
}

function DisplayComponent({ value }) {
  return <h1>{value}</h1>;
}

In this case, the value state is lifted to the parent component and passed down as props to both the InputComponent and DisplayComponent. This way, when the user types in the input field, the state in the parent is updated, and the change is reflected in the display component.

9. How do you pass data between parent and child components in React?

In React, passing data between parent and child components is done using props. The parent component sends data to the child component by defining a property on the child component and assigning it a value. The child component can then access this data through the props object. For example:

function Parent() {
  const message = "Hello from the parent!";
  return <Child message={message} />;
}

function Child({ message }) {
  return <h1>{message}</h1>;
}

In this example, the Parent component passes the message as a prop to the Child component, which then displays it. If the child needs to send data back to the parent, I can pass a function as a prop from the parent, which the child can call with the necessary data. Here’s an example:

function Parent() {
  const handleData = (data) => {
    console.log("Received from child:", data);
  };

  return <Child sendData={handleData} />;
}

function Child({ sendData }) {
  return <button onClick={() => sendData("Hello, Parent!")}>Send Data</button>;
}

In this case, the Child component calls the sendData function passed from the Parent component, allowing data to flow from child to parent.

10. Can you explain the difference between controlled and uncontrolled components in React?

In React, the difference between controlled and uncontrolled components lies in how the component’s form data is handled. In a controlled component, the form data is fully controlled by the component’s state. The value of the input is set by the state, and any changes to the input are handled through event listeners that update the state. I have full control over the form data, and can validate, modify, or reset it easily. Here’s an example of a controlled component:

function ControlledInput() {
  const [inputValue, setInputValue] = useState("");

  return (
    <input
      type="text"
      value={inputValue}
      onChange={(e) => setInputValue(e.target.value)}
    />
  );
}

In an uncontrolled component, the form data is handled by the DOM itself, not by the state. I would typically use a ref to access the form data. In this case, React does not directly control the input value. Instead, the form elements maintain their own internal state, and I retrieve the value when needed, usually when the form is submitted. Here’s an example:

function UncontrolledInput() {
  const inputRef = useRef(null);

  const handleSubmit = () => {
    console.log(inputRef.current.value);
  };

  return (
    <div>
      <input type="text" ref={inputRef} />
      <button onClick={handleSubmit}>Submit</button>
    </div>
  );
}

Controlled components give me more control over the form’s behavior, allowing real-time validation and data manipulation. Uncontrolled components are simpler but offer less flexibility, as the state is managed by the DOM rather than React’s state mechanism.

<<< React Hooks >>>

11. What are React Hooks, and how do they replace lifecycle methods in functional components?

React Hooks are functions that allow me to use state and other React features in functional components. Before the introduction of Hooks, managing state and lifecycle events was only possible in class components. Hooks essentially enable functional components to have the same capabilities without needing to convert them into class components. They provide a simpler and more streamlined way of handling common tasks like state management, side effects, and context management in functional components.

By using Hooks like useState and useEffect, I can replicate the behavior of lifecycle methods (such as componentDidMount, componentDidUpdate, and componentWillUnmount) in functional components. For example, useEffect allows me to perform actions after a component renders, similar to the functionality of componentDidMount. This way, Hooks remove the need for verbose lifecycle methods and make the code more readable and maintainable in a functional approach.

12. Explain the useEffect hook in React. How do you handle side effects with it?

The useEffect hook is one of the most powerful hooks in React as it allows me to handle side effects in functional components. Side effects refer to anything that interacts with the external environment or needs to occur after the component renders, such as API calls, timers, or directly manipulating the DOM. With useEffect, I can specify a function to run after each render, and I can control when it runs by passing dependencies.

Here’s an example of using useEffect to fetch data from an API:

useEffect(() => {
  fetch('https://api.example.com/data')
    .then(response => response.json())
    .then(data => setData(data));
}, []);

In this case, the empty array [] ensures that the effect runs only once, mimicking the behavior of componentDidMount. I can also use it to clean up side effects, such as removing event listeners or clearing timers when the component unmounts. By returning a cleanup function inside useEffect, I ensure that resources are properly released, which is particularly useful for optimizing performance.

13. How does the useState hook work, and when would you use it over class-based state management?

The useState hook is the simplest way to manage state in functional components. It lets me declare a piece of state that React will keep track of and automatically update the component when that state changes. I use it by calling useState(initialValue) and getting back an array with two elements: the current state value and a function to update it. Here’s an example:

const [count, setCount] = useState(0);

const handleClick = () => {
  setCount(count + 1);
};

In this example, count is the state value, and setCount is the function I use to update it. When I call setCount, React will re-render the component with the new state value. This hook offers a simpler and more concise way to manage state compared to class components, where I would need to use this.state and this.setState.

I prefer using useState over class-based state management because it makes my code more readable and allows me to focus on the component logic without dealing with the complexities of class syntax. It also removes the need for binding this, which is necessary in class components, making functional components easier to manage in large projects.

14. What is the useContext hook, and how can it be used to avoid prop drilling?

The useContext hook provides a way to access context values directly in a component without needing to pass props manually through each level of the component tree. This helps me avoid prop drilling, which occurs when I have to pass props through many nested components just to get data to a deeply nested child. With useContext, I can share state or functions across multiple components without the need for intermediate components to handle or pass down the props.

For instance, if I have a global theme for my application, I can create a ThemeContext at the top level and use useContext to access the theme in any child component that needs it. Here’s an example:

const ThemeContext = React.createContext();

function ChildComponent() {
  const theme = useContext(ThemeContext);
  return <div style={{ background: theme.background }}>Hello, Theme!</div>;
}

function ParentComponent() {
  return (
    <ThemeContext.Provider value={{ background: 'blue' }}>
      <ChildComponent />
    </ThemeContext.Provider>
  );
}

In this example, the ChildComponent directly accesses the theme provided by the ParentComponent without having to pass the theme through intermediate components. This makes the code more modular and easier to maintain, especially in large applications where data needs to be accessed by many components.

15. How would you optimize a React component using the useMemo and useCallback hooks?

To optimize React components, I often use the useMemo and useCallback hooks to prevent unnecessary re-renders and improve performance. useMemo is used to memoize the result of a computation, meaning it will only recompute the value if its dependencies change. This is particularly useful when I have expensive calculations that should not run on every render. Here’s an example:

const expensiveCalculation = useMemo(() => {
  return performHeavyComputation(data);
}, [data]);

In this case, performHeavyComputation will only be called when data changes, not on every render, saving computational resources. This is ideal when dealing with large datasets or complex calculations.

On the other hand, useCallback is used to memoize functions, ensuring that the same function reference is passed down to child components. This is useful when passing functions as props, as it prevents child components from re-rendering unnecessarily. Here’s how I use useCallback:

const handleClick = useCallback(() => {
  console.log("Button clicked!");
}, []);

By using useCallback, I ensure that the handleClick function maintains the same reference between renders unless its dependencies change. This is crucial when working with components that rely heavily on props, as it helps me prevent prop-driven re-renders in child components and maintain optimal performance.

<<< Advanced React Concepts >>>

16. Explain higher-order components (HOCs) in React. How do they enhance component functionality?

Higher-order components (HOCs) are a pattern in React that allow me to enhance the functionality of a component by wrapping it in another component. Essentially, an HOC takes a component as an input and returns a new, enhanced component. This pattern is often used for code reuse and cross-cutting concerns such as authentication, logging, or theme management. HOCs don’t alter the component’s functionality directly but instead add new behaviors or data through props.

For example, I can use an HOC to add logging to a component’s lifecycle or manage authentication across multiple components. Here’s a simple example of an HOC:

function withLogging(WrappedComponent) {
  return class extends React.Component {
    componentDidMount() {
      console.log('Component has mounted');
    }

    render() {
      return <WrappedComponent {...this.props} />;
    }
  };
}

In this example, the withLogging HOC wraps a component and logs when it mounts. This demonstrates how HOCs can enhance existing components without modifying their core logic, making them a powerful tool for reusable functionality in large-scale applications.

17. What are React portals, and when would you use them?

React portals provide a way to render child components into a different part of the DOM than the component’s parent. Typically, a component renders its children into its own DOM hierarchy, but with portals, I can render children into any DOM node outside of this hierarchy while still maintaining React’s context and event bubbling system. This is particularly useful when I want to display elements like modals, tooltips, or pop-ups that need to be visually detached from their parent components but still tied logically to their state and behavior.

For example, a modal might need to be rendered outside the parent component’s structure to avoid CSS issues like overflow, but it should still remain part of the parent component’s state. Here’s how I’d use ReactDOM.createPortal to render a modal outside the parent component:

ReactDOM.createPortal(
  <div className="modal">This is a modal</div>,
  document.getElementById('modal-root')
);

In this case, the modal renders to a DOM node with the id modal-root, which can be placed anywhere in the HTML. I would use portals when I need to break out of the normal DOM flow while keeping the functionality and state management within React’s structure.

18. How would you implement lazy loading in React for improved performance?

Lazy loading in React is a technique I use to load components only when they are needed, which improves performance by reducing the initial bundle size. It’s particularly useful for large applications where not all components are needed immediately on page load. With lazy loading, React can defer loading parts of the app until they are needed, such as when a user navigates to a specific route or performs a certain action.

React provides the React.lazy function to implement lazy loading in combination with Suspense.

Here’s a basic example:

const LazyComponent = React.lazy(() => import('./LazyComponent'));

function App() {
  return (
    <Suspense fallback={<div>Loading...</div>}>
      <LazyComponent />
    </Suspense>
  );
}

In this example, LazyComponent is only loaded when it’s needed, and while it’s being loaded, the fallback <div>Loading...</div> is displayed. This reduces the initial load time of the application by splitting the bundle into smaller chunks and loading them dynamically, which is especially helpful in optimizing the performance of large-scale React applications.

19. What is React’s context API, and how does it differ from state management tools like Redux?

The React Context API allows me to share state globally across multiple components without the need for prop drilling. It provides a way to create a global state that can be accessed by any component within the context’s provider, making it easier to pass data deeply into the component tree without explicitly passing it down through each level. I use the React.createContext function to create a context and then access it via useContext or Context.Consumer.

While the Context API is great for simple state management, it’s not as comprehensive as Redux when dealing with more complex applications. Redux is a more structured state management tool that follows a predictable state container model. Redux uses actions, reducers, and a global store to manage state in a centralized manner. It also supports advanced features like middleware, time-travel debugging, and side effect handling with libraries like Redux-Saga or Redux-Thunk.

In contrast, React’s Context API is more lightweight and straightforward, making it ideal for smaller applications or for managing global states that don’t require the complexity of Redux.

20. Describe how error boundaries work in React and how they handle errors in the UI.

Error boundaries in React are components that catch JavaScript errors anywhere in their child component tree, log the error, and display a fallback UI instead of crashing the entire app. They are created by implementing the componentDidCatch lifecycle method and getDerivedStateFromError. Error boundaries catch errors during rendering, in lifecycle methods, and in the constructors of their child components, but they do not catch errors inside event handlers.

Here’s how I’d implement an error boundary:

class ErrorBoundary extends React.Component {
  constructor(props) {
    super(props);
    this.state = { hasError: false };
  }

  static getDerivedStateFromError(error) {
    return { hasError: true };
  }

  componentDidCatch(error, errorInfo) {
    console.error("Error occurred:", error, errorInfo);
  }

  render() {
    if (this.state.hasError) {
      return <h1>Something went wrong.</h1>;
    }

    return this.props.children;
  }
}

In this example, if any child component throws an error, the error boundary catches it, and a fallback UI (Something went wrong.) is displayed. Error boundaries enhance the user experience by preventing full app crashes and allowing me to handle errors gracefully, often logging them for further investigation and showing a user-friendly message.

<<< React Router and Navigation >>>

21. How does React Router work, and how would you implement dynamic routing in an application?

React Router is a standard library in React that helps me manage navigation and rendering of different components based on the URL path. It allows me to create a single-page application (SPA) where the browser does not reload the page but changes the view based on the route. React Router listens for changes in the URL and renders the corresponding component without requiring a full-page refresh.

To implement dynamic routing, I can define routes that adjust based on parameters in the URL. For example, in a blog application, I can have a route like /post/:id, where :id is dynamic and could correspond to different blog posts. Here’s a simple example of dynamic routing:

import { BrowserRouter as Router, Route, Switch } from 'react-router-dom';

function App() {
  return (
    <Router>
      <Switch>
        <Route path="/post/:id" component={PostDetail} />
      </Switch>
    </Router>
  );
}

function PostDetail({ match }) {
  return <div>Post ID: {match.params.id}</div>;
}

In this code, React Router dynamically matches the :id parameter and renders the PostDetail component based on the specific post ID. This allows me to create flexible, parameterized routes in my application that can render content based on user interaction.

22. How do you handle route transitions and navigation in a React single-page application?

In a React single-page application (SPA), route transitions happen without reloading the page, thanks to React Router. I can handle navigation and transitions by using the Link component, which updates the browser’s URL and renders the corresponding component without refreshing the page. React Router provides different ways to handle these transitions smoothly.

To enable navigation, I use the Link or NavLink components instead of traditional anchor tags.

For example:

import { Link } from 'react-router-dom';

function Navbar() {
  return (
    <nav>
      <Link to="/">Home</Link>
      <Link to="/about">About</Link>
      <Link to="/contact">Contact</Link>
    </nav>
  );
}

This ensures that navigating between routes happens seamlessly, without a full-page reload, which is essential for SPAs. Additionally, I can handle more complex route transitions using libraries like react-transition-group to add animations when switching between routes, enhancing the user experience. I would use Switch or Routes components in React Router to manage different routes and ensure only one route is rendered at a time.

See more: TCS AngularJS Developer Interview Questions

23. Explain how to protect routes in React by using private routes or authentication-based routing.

In a React application, I often need to protect routes that require authentication or specific permissions. To achieve this, I can create private routes that only render a component if the user is authenticated or meets certain criteria. If the user is not authorized, I can redirect them to a login page or an error page.

A simple way to implement private routes is by creating a higher-order component (HOC) that checks whether the user is authenticated. Here’s an example:

import { Route, Redirect } from 'react-router-dom';

function PrivateRoute({ component: Component, isAuthenticated, ...rest }) {
  return (
    <Route
      {...rest}
      render={(props) =>
        isAuthenticated ? (
          <Component {...props} />
        ) : (
          <Redirect to="/login" />
        )
      }
    />
  );
}

In this example, the PrivateRoute component checks if the isAuthenticated prop is true. If the user is authenticated, it renders the desired component; otherwise, it redirects them to the login page. This is how I can effectively secure certain routes in a React app, ensuring that only authorized users can access specific sections of the application. This is crucial in applications where user data or sensitive information needs protection.

<<< State Management (Redux/Context API) >>>

24. What is Redux, and how does it manage the global state in a React application?

Redux is a predictable state management library that helps me manage the global state in a React application. It follows a unidirectional data flow and is especially useful in complex applications where state needs to be shared across many components. Redux provides a central store that holds the state of the entire application, and components can access this state without having to pass props manually down through the component tree. The key advantage is that it makes the state management more predictable and maintainable.

In Redux, the state is managed in a single source of truth (the store), and updates to the state are performed through actions and reducers. I dispatch actions that describe what should change, and reducers handle how the state changes based on those actions. For example, when a user logs in, I might dispatch a LOGIN_SUCCESS action, and the reducer updates the state to store the user’s information. Here’s a small snippet showing how Redux works:

const initialState = { loggedIn: false };

function authReducer(state = initialState, action) {
  switch (action.type) {
    case 'LOGIN_SUCCESS':
      return { ...state, loggedIn: true };
    default:
      return state;
  }
}

const store = createStore(authReducer);
store.dispatch({ type: 'LOGIN_SUCCESS' });
console.log(store.getState()); // { loggedIn: true }

In this example, Redux manages the global state of authentication. This centralized state management helps to avoid prop drilling and ensures consistency throughout the application.

25. How would you handle asynchronous actions in Redux, and what are some tools to help manage side effects like API calls?

Handling asynchronous actions in Redux, such as API calls, requires some additional middleware, as Redux is designed to handle synchronous actions by default. One common approach is to use Redux Thunk or Redux Saga to manage asynchronous actions and side effects.

With Redux Thunk, I can write action creators that return functions instead of objects. This allows me to handle asynchronous logic like API requests inside the action creators. For example, when fetching data from an API, I can dispatch an action to indicate the request is starting, then dispatch another action with the result when the data is fetched:

const fetchData = () => {
  return (dispatch) => {
    dispatch({ type: 'FETCH_DATA_REQUEST' });
    fetch('https://api.example.com/data')
      .then((response) => response.json())
      .then((data) => dispatch({ type: 'FETCH_DATA_SUCCESS', payload: data }))
      .catch((error) => dispatch({ type: 'FETCH_DATA_FAILURE', error }));
  };
};

In this case, Redux Thunk allows me to dispatch multiple actions depending on the outcome of the API call. I can manage the loading state, success, and error states easily using this approach.

Alternatively, Redux Saga is another powerful tool that uses generator functions to handle asynchronous side effects. It allows for more complex flows, like retrying failed requests or coordinating multiple actions in a sequence. Whether I use Redux Thunk or Redux Saga depends on the complexity of the app’s side effects and the degree of control I need over the async logic. Both tools help me manage side effects in a clean and efficient manner within a Redux-powered React application.

Conclusion

Landing a role as an Accenture Software Engineer specializing in React JS demands more than just basic knowledge of the framework. You’ll need to demonstrate a solid grasp of React fundamentals, along with the ability to handle advanced topics like state management with Redux or Context API, and effectively use React Hooks for optimized component behavior. Accenture looks for candidates who can not only explain concepts like the virtual DOM and JSX but also apply them in real-world scenarios, showcasing the ability to build scalable, high-performance applications. Mastering these concepts is essential for standing out during the interview process.

Accenture’s technical interviews emphasize problem-solving and practical application, so expect to face questions about performance optimization, asynchronous data handling, and routing techniques. Being able to articulate how you’d implement solutions for dynamic routing, handle protected routes, and use tools like useEffect and useState effectively will demonstrate your readiness for complex challenges. With the global impact and scale of Accenture’s projects, this is your chance to prove you can contribute meaningfully to cutting-edge solutions. Thorough preparation on these topics will position you as a top candidate, ready to make a real difference in the dynamic world of React development.

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Accenture Software Engineer React JS Interview Questions

Table Of Contents

<<< Fundamentals of React JS >>>

1. What is the virtual DOM in React, and how does it improve performance?

2. How do you create a React component, and what are the differences between class and functional components?

3. Explain the purpose of keys in React. Why are they important in lists?

4. What is JSX in React, and how does it differ from traditional JavaScript?

5. How does React’s reconciliation process work when updating the DOM?

<<< State and Props Management >>>

6. What is the difference between state and props in React, and how do they interact with each other?

7. How can you manage the state in a complex React application with multiple components?

8. Explain how lifting state works in React, and provide an example where it’s necessary.

9. How do you pass data between parent and child components in React?

10. Can you explain the difference between controlled and uncontrolled components in React?

<<< React Hooks >>>

11. What are React Hooks, and how do they replace lifecycle methods in functional components?

12. Explain the useEffect hook in React. How do you handle side effects with it?

13. How does the useState hook work, and when would you use it over class-based state management?

14. What is the useContext hook, and how can it be used to avoid prop drilling?

15. How would you optimize a React component using the useMemo and useCallback hooks?

<<< Advanced React Concepts >>>

16. Explain higher-order components (HOCs) in React. How do they enhance component functionality?

17. What are React portals, and when would you use them?

18. How would you implement lazy loading in React for improved performance?

19. What is React’s context API, and how does it differ from state management tools like Redux?

20. Describe how error boundaries work in React and how they handle errors in the UI.

<<< React Router and Navigation >>>

21. How does React Router work, and how would you implement dynamic routing in an application?

22. How do you handle route transitions and navigation in a React single-page application?

23. Explain how to protect routes in React by using private routes or authentication-based routing.

<<< State Management (Redux/Context API) >>>

24. What is Redux, and how does it manage the global state in a React application?

25. How would you handle asynchronous actions in Redux, and what are some tools to help manage side effects like API calls?

Conclusion

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