React Most Imp Interview Questions: Part 4

I have started the most in-demand React Interview Questions Series. Don’t forget to follow me to stay updated with all the questions. This is Part 4.

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1. What is the purpose of the shouldComponentUpdate method?

The shouldComponentUpdate method is used to optimize performance by determining whether a component needs to be updated before re-rendering it.

Example:

2. What is the purpose of the setState method?

The setState method is used to update the state of a component and trigger a re-render.

3. What is the purpose of the componentDidMount method?

The componentDidMount method is called after a component is mounted and allows you to perform actions such as fetching data from an API or setting up event listeners.

4. What is the purpose of the componentWillUnmount method?

The componentWillUnmount method is called just before a component is unmounted and allows you to perform cleanup actions such as removing event listeners or clearing intervals.