React State Management Quiz

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Question 1/15

What does the Provider component in a Redux application do?

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Question 2/15

What is the default behavior of Context in React regarding re-renders?

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Question 3/15

Why is the concept of immutable state vital in Redux?

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Question 4/15

What is the common way to improve performance for a component consistently re-rendering due to state changes?

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Question 5/15

When is it recommended to use useCallback in React?

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Question 6/15

What is the primary purpose of React's useState hook?
const [count, setCount] = useState(0);

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Question 7/15

In Redux, what is a pure function in terms of reducers?

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Question 8/15

Why should keys be unique among siblings in React?

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Question 9/15

What is React's useEffect hook used for?

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Question 10/15

When handling forms in React, why is controlled component considered best practice?

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Question 11/15

In a React functional component, what is the correct way to update a state variable that holds an object?
const [user, setUser] = useState({ name: 'John', age: 30 });

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Question 12/15

In React, what is the main benefit of lifting state up?

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Question 13/15

What problem does React Context API primarily solve?

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Question 14/15

What does the useRef hook in React primarily serve?

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Question 15/15

Which of the following concepts does NOT involve React component state management?

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Your Answers

Question 1/15
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What does the Provider component in a Redux application do?

Available answers

The Provider component from the react-redux library makes the Redux store available to the rest of the app. By wrapping the application's component tree, it provides components with the ability to connect to the Redux store.
Question 2/15
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What is the default behavior of Context in React regarding re-renders?

Available answers

React's Context API will cause components that are consuming context data to re-render whenever there is a change in the context's Provider value. This default behavior can be optimized using React.memo or memoized selectors when appropriate.
Question 3/15
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Why is the concept of immutable state vital in Redux?

Available answers

Maintaining an immutable state in Redux ensures predictability and verifiability. Each state change creates a new copy of the state, ensuring that changes are explicit and the application state remains predictable, which simplifies debugging.
Question 4/15
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What is the common way to improve performance for a component consistently re-rendering due to state changes?

Available answers

To prevent unnecessary re-renders due to the same props and state in a React component, wrapping the component with React.memo optimizes performance by memoizing the rendered output unless there are meaningful prop changes.
Question 5/15
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When is it recommended to use useCallback in React?

Available answers

The useCallback hook in React is recommended when you have a function that needs to retain the same instance between renders, preventing unnecessary re-creations especially when passing it as a prop to child components that could result in unneeded renders.
Question 6/15
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What is the primary purpose of React's useState hook?
const [count, setCount] = useState(0);

Available answers

The useState hook in React allows you to add state to functional components. It returns an array with the state value and a function to update it. The code snippet
const [count, setCount] = useState(0);
initializes a state variable count with a value of 0.
Question 7/15
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In Redux, what is a pure function in terms of reducers?

Available answers

Reducers in Redux are pure functions. This means they always return the same output for a given input and do not produce side effects like data fetching or mutations outside their scope. The intention is to maintain predictable state transformations.
Question 8/15
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Why should keys be unique among siblings in React?

Available answers

Keys are vitally important in React as they help identify which items have changed, are added, or removed among a collection of sibling elements. They must be unique among their siblings but can be duplicated across different sets of sibling elements.
Question 9/15
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What is React's useEffect hook used for?

Available answers

The useEffect hook in React is used for performing side effects in function components, such as data fetching, subscriptions, or manually changing the DOM. It replaces the side-effect features of lifecycle methods in class components.
Question 10/15
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When handling forms in React, why is controlled component considered best practice?

Available answers

Controlled components in React refer to form elements being controlled by React state. This approach ensures that the rendered form is always in sync with the component's state, providing better control over data submission, validation, and component behavior.
Question 11/15
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In a React functional component, what is the correct way to update a state variable that holds an object?
const [user, setUser] = useState({ name: 'John', age: 30 });

Available answers

When updating a state variable that holds an object in React, you should use the spread operator to create a new object with the updated fields. The option
setUser({ ...user, name: 'Jane' });
creates a new object with the existing properties from user and only changes the name property.
Question 12/15
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In React, what is the main benefit of lifting state up?

Available answers

Lifting state up in React involves moving shared state to a common ancestor component, allowing different sibling components to access and sync the state. This approach supports better data flow and state management across components.
Question 13/15
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What problem does React Context API primarily solve?

Available answers

The React Context API allows you to share values between components without having to explicitly pass props through every level of the tree. This is particularly useful to avoid 'prop drilling' when you have deeply nested components.
Question 14/15
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What does the useRef hook in React primarily serve?

Available answers

The useRef hook in React is used to persist values across renders without triggering a re-render when the value updates. This is particularly useful for accessing DOM elements directly and storing mutable values.
Question 15/15
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Which of the following concepts does NOT involve React component state management?

Available answers

CSS-in-JS libraries, although used widely with React for styling components, primarily deal with styling rather than state management. On the other hand, useState, Redux, and Context API are directly related to managing state within React applications.