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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answer was correct
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answer was incorrect
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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answer was correct
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answer was incorrect
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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answer was correct
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answer was incorrect
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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answer was correct
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answer was incorrect
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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answer was correct
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answer was incorrect
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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answer was correct
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answer was incorrect
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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answer was correct
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answer was incorrect
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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answer was correct
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answer was incorrect
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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answer was correct
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answer was incorrect
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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answer was correct
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answer was incorrect
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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answer was correct
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answer was incorrect
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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answer was correct
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answer was incorrect
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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answer was correct
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answer was incorrect
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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answer was correct
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answer was incorrect
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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answer was correct
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answer was incorrect
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.