React Class Components Quiz

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React class lifecycle basics

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Vici Hall

India

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React Class Components Quiz


React Class Components QuizOnline version React class lifecycle basics by Vici Hall 1 1) In a React class component, which method runs after the component is mounted to the DOM? a constructor b componentWillUnmount c render d componentDidMount 2 2) Which method is commonly used to initialize state in a class component? a getDerivedStateFromProps b render c componentDidMount d constructor 3 3) How are event handlers typically bound in a React class component? a Bind in the constructor (e.g., this.handleClick = this.handleClick.bind(this)) b Use an arrow function in render c Bind in render with this.handleClick.bind(this) d Use a functional component instead 4 4) Which lifecycle method runs to derive state from props before rendering? a getDerivedStateFromProps b componentDidMount c render d componentWillUnmount 5 5) What lifecycle method is called just before a component is removed from the DOM? a componentDidMount b componentDidUpdate c render d componentWillUnmount 6 6) True or False: The render method can set state directly inside it. Choose one or more answers a True b False 7 7) Which lifecycle method lets you optimize rendering by skipping updates? a render b componentWillUnmount c componentDidUpdate d shouldComponentUpdate 8 8) Where is the initial state typically declared in a class component? a Outside the class b In render c In the constructor via this.state d In a separate state file 9 9) What method must return the JSX to render? a getDerivedStateFromProps b componentDidMount c render d constructor 10 10) How do you access passed props inside a class component? a Using this.props b Using Component.props c Using props d Using this.state props e Using this.props.state 11 11) True or False: componentDidMount runs on every re-render. Choose one or more answers a False b True 12 12) True or False: componentWillUnmount is called when the component is removed from the DOM. Choose one or more answers a True b False 13 13) True or False: shouldComponentUpdate is used to prevent unnecessary re-renders. a False b True 14 14) Fill in the blank: The lifecycle method called after a component updates due to state/props change is ____________. a componentDidUpdate b componentDidMount c componentWillUpdate 15 15) Fill in the blank: A stateful React class component typically extends React.___. a Class b Hooks c Component d PureComponent

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React Class Components Quiz

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Created by

Download the paper version to play

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React Class Components QuizOnline version

by Vici Hall

1) In a React class component, which method runs after the component is mounted to the DOM?

2) Which method is commonly used to initialize state in a class component?

3) How are event handlers typically bound in a React class component?

4) Which lifecycle method runs to derive state from props before rendering?

5) What lifecycle method is called just before a component is removed from the DOM?

6) True or False: The render method can set state directly inside it.

Choose one or more answers

7) Which lifecycle method lets you optimize rendering by skipping updates?

8) Where is the initial state typically declared in a class component?

9) What method must return the JSX to render?

10) How do you access passed props inside a class component?

11) True or False: componentDidMount runs on every re-render.

Choose one or more answers

12) True or False: componentWillUnmount is called when the component is removed from the DOM.

Choose one or more answers

13) True or False: shouldComponentUpdate is used to prevent unnecessary re-renders.

14) Fill in the blank: The lifecycle method called after a component updates due to state/props change is ____________.

15) Fill in the blank: A stateful React class component typically extends React.___.