React Class Components: Lifecycle Quiz

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Lifecycle basics & coding

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Vici Hall

India

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React Class Components: Lifecycle Quiz


React Class Components: Lifecycle QuizVersion en ligne Lifecycle basics & coding par Vici Hall 1 Which lifecycle method runs after a component is mounted? a componentWillMount b componentDidMount c render d componentDidUpdate 2 Where should you initialize state in a React class component? a as a global variable b in render c in the constructor d in componentDidMount 3 Which method is used to clean up before a component is removed from the DOM? a render b componentWillUnmount c componentDidMount d componentDidUpdate 4 Which lifecycle method can be used to update state based on changes in props? a componentDidUpdate b getDerivedStateFromProps c componentWillUnmount d render 5 Which method runs after every render when props or state change and can prevent re-render? a shouldComponentUpdate b render c componentDidMount d componentWillUpdate 6 Which lifecycle method is static and does not have access to this? a render b componentDidMount c componentWillUnmount d getDerivedStateFromProps 7 Which method is called after a component updates and re-renders? a componentDidUpdate b render c componentDidMount d componentWillUpdate 8 How do you ensure 'this' refers to the component in an event handler? a bind in render b use arrow functions only c use a global function d bind in the constructor 9 Which lifecycle method is safe to call setState after data is fetched? a componentDidMount b getDerivedStateFromProps c componentWillUnmount d render 10 Which method is used to sync state from props during mounting? a render b getDerivedStateFromProps c componentWillUnmount d componentDidMount 11 Fill in the blank: The lifecycle method that runs after the component is mounted is ______. a componentWillUnmount b componentDidMount c componentDidUpdate d render 12 Fill in the blank: The static method that updates state from props is ______. a getDerivedStateFromProps b shouldComponentUpdate c componentDidMount d render 13 Fill in the blank: The method to decide if a re-render should occur is ______. a shouldComponentUpdate b componentDidUpdate c render d componentWillUnmount 14 Fill in the blank: Cleanup before unmounting happens in ______. a render b componentDidMount c componentDidUpdate d componentWillUnmount

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React Class Components: Lifecycle Quiz

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Créé par

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React Class Components: Lifecycle QuizVersion en ligne

par Vici Hall

Which lifecycle method runs after a component is mounted?

Where should you initialize state in a React class component?

Which method is used to clean up before a component is removed from the DOM?

Which lifecycle method can be used to update state based on changes in props?

Which method runs after every render when props or state change and can prevent re-render?

Which lifecycle method is static and does not have access to this?

Which method is called after a component updates and re-renders?

How do you ensure 'this' refers to the component in an event handler?

Which lifecycle method is safe to call setState after data is fetched?

Which method is used to sync state from props during mounting?

Fill in the blank: The lifecycle method that runs after the component is mounted is ______.

Fill in the blank: The static method that updates state from props is ______.

Fill in the blank: The method to decide if a re-render should occur is ______.

Fill in the blank: Cleanup before unmounting happens in ______.