React-native : What is state?

State works differently when compared to props. State is internal to a component, while props are passed to a component.

Keep in mind not to update state directly using this.state. Always use setState to update the state objects. Using setState re-renders the component and all the child components. This is great, because you don’t have to worry about writing event handlers like other languages.

class Form extends React.Component {

  constructor (props) {
     super(props)
     this.state = {
       input: ''
     }
  }

handleChangeInput = (text) => {
    this.setState({ input: text })
  }
 
  render () {
    const { input } = this.state

    return (
      
                      onChangeText={this.handleChangeInput}
            value={input}
          />
       
      )
    }
}

In the above code snippet you can see a Form class with an input state. It renders a text input which accepts the user’s input. Once the user inputs the text, the onChangeText is triggered which in turn calls setState on input.




References:
https://codeburst.io/props-and-state-in-react-native-explained-in-simple-english-8ea73b1d224e