Why use refs in react? What is the use cases for it?

This question exists but it didn’t give a lot of data or real world explanation: What are Refs in React or React-Native and what is the importance of using them

Let’s say i want to integrate to 3rd party library how ref is going to help me?

Answer

Some 3rd party libraries expose methods to interact with their components.

For example, in react-native-elements npm, they have shake method for Input component. You can use this method to shake Input element when user input is invalid.

Common use case is as follows:

import React from 'react';
import { Input, Button } from 'react-native-elements';
const [value, setValue] = useState('');
const input = React.createRef();

return (
  <View>
    <Input
      ref={input}
      onTextChange={(text) => setValue(text)}
    />
    <Button 
      title={'Submit'}
      onPress={() => {
        if (!isValid(value)) {
          input.current.shake();
        }
      }}
    />
  </View>
);

This is react native example, but the similar goes to react projects. I hope you get the picture. Animations like shake cannot be easily handled with state, so it’s better to use useRef to call component methods directly.