setstate default code example

Example 1: lifecycles if reactjs

class Clock extends React.Component {
  constructor(props) {
    super(props);
    this.state = {date: new Date()};
  }

  componentDidMount() {  }
  componentWillUnmount() {  }
  render() {
    return (
      
        Hello, world!
        It is {this.state.date.toLocaleTimeString()}.
      
    );
  }
}

Example 2: how to use setstate

class App extends React.Component {

state = { count: 0 }

handleIncrement = () => {
  this.setState({ count: this.state.count + 1 })
}

handleDecrement = () => {
  this.setState({ count: this.state.count - 1 })
}
  render() {
    return (
      
        
          {this.state.count}
        
        
        
      
    )
  }
}

Tags:

Misc Example

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