React Quiz Review
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Questions and Answers

Which method is used in React Testing Library to assert that an element is not visible on the screen?

  • queryByText
  • getByText
  • queryByTestId (correct)
  • getByTestId

    • What is the correct method used to update state in a React component?

  • modifyState()
  • changeState()
  • setState() (correct)
  • updateState()

    • Which React component lifecycle method is utilized for performing debugging tasks?

  • componentDidUpdate() (correct)
  • componentWillUnmount()
  • render()
  • componentDidMount()

    • Which React DevTools feature allows users to simulate events and interactions with components?

    <p>Console tab</p> Signup and view all the answers

    Which function is not associated with configuring change listeners in React?

    <p>None of these</p> Signup and view all the answers

    Which of the following methods can be used in React to completely remove a component from the DOM?

    <p>componentWillUnmount()</p> Signup and view all the answers

    Which method is best suited for running side effects after a component's state or props have changed?

    <p>componentDidUpdate()</p> Signup and view all the answers

    In React, what should you use to retrieve the state value within a function component?

    <p>useState()</p> Signup and view all the answers

    What characteristic defines Flux in React?

    <p>Pattern</p> Signup and view all the answers

    What is the role of the key prop in React components?

    <p>To identify a child element of a component</p> Signup and view all the answers

    Which lifecycle method is used to prepopulate forms in a React component?

    <p>componentWillMount</p> Signup and view all the answers

    Which function renders child components in a React component?

    <p>render()</p> Signup and view all the answers

    Which attribute is used in a React reusable text input component, important for component reuse?

    <p>className</p> Signup and view all the answers

    What is essential for simple routing between React components without using React Router?

    <p>The hashchange event</p> Signup and view all the answers

    Which React lifecycle method is called immediately after a component is mounted?

    <p>componentDidMount</p> Signup and view all the answers

    In a React function component, which hook is used to manage side effects?

    <p>useEffect</p> Signup and view all the answers

    What does the spread operator (...) do in React?

    <p>Spreads the properties of an object or array into a new object or array</p> Signup and view all the answers

    What is the role of the key prop in React when rendering dynamic children?

    <p>Adds a unique identifier to each child element</p> Signup and view all the answers

    Which CSS property controls the spacing outside an element in React?

    <p>margin</p> Signup and view all the answers

    Which CSS unit is preferred for responsive designs in React?

    <p>%</p> Signup and view all the answers

    What is the correct syntax for rendering a list of items in React using the map() function?

    <p>{items.map(item =&gt; <div>{item}</div>)}</p> Signup and view all the answers

    Which of the following properties is NOT typically affected by the margin property?

    <p>The size of the element itself</p> Signup and view all the answers

    What is a common mistake when using the key prop in React?

    <p>Using non-unique values for keys</p> Signup and view all the answers

    Which of the following CSS unit provides a fixed size and does not adjust based on the parent element?

    <p>px</p> Signup and view all the answers

    Study Notes

    React Quiz Review

    • The spread operator (...) creates new objects or arrays by merging or spreading the properties of two or more objects or arrays.
    • The key prop in React is used to provide a unique identifier for each child element when working with dynamic lists or arrays. This is essential for React to efficiently update and track elements as they change.
    • The margin CSS property controls the spacing between elements in React. It can be used to create space around an element, including top, bottom, left, and right margins.
    • The percentage (%) CSS unit is recommended for responsive designs as it allows elements to scale with the overall viewport size and maintain proper proportions.
    • Correct syntax to render a list of items in React using map() function is {items.map((item) => { return ... } )} .
    • Flux is a design pattern used in React that promotes a unidirectional data flow architecture.
    • The key prop is used to identify individual child elements of a component in React.
    • The componentWillMount lifecycle method in React can be used to prepopulate a form in a React form component.
    • The render() function will display all child components of a provided component.
    • The className attribute should be set in a React reusable text input component and is often used for component reuse and providing a unique identifier for styling.
    • The hashchange event is the most basic way to implement routing between React components without using a dedicated React routing library.
    • queryByTestId() is the method in React Testing Library used to check if an element is not visible on the screen.
    • setState() is the method used to update state in React.
    • componentDidUpdate() is a React component lifecycle method that can be used for debugging purposes as it gets called after the component updates.
    • The Profiler tab in React DevTools can be used to simulate user events and interactions with a component to monitor performance and identify potential bottlenecks.
    • deregisterListener, registerListener and change are the common functions used to configure change listeners in React Flux.

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    Description

    Test your knowledge on key React concepts in this quiz. From the spread operator to the key prop and CSS properties, cover essential topics that every React developer should understand. Challenge yourself and enhance your understanding of React fundamentals.

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