life cycle components react code example

Example 1: lifecycle methods react

Every component in React goes through a lifecycle of events. I like to think of them as going through a cycle of birth, growth, and death.

Mounting – Birth of your component
Update – Growth of your component
Unmount – Death of your component

Example 2: react lifecycle

constructor(props) {
  super(props);
  // Don't call this.setState() here!
  this.state = { counter: 0 };
  this.handleClick = this.handleClick.bind(this);
}

Example 3: Component life cycle

class LifeCycle extends React.Component {
      constructor(props)
      {
        super(props);
         this.state = {
           date : new Date(),
           clickedStatus: false,
           list:[]
         };
      }
      componentWillMount() {
          console.log('Component will mount!')
       }
      componentDidMount() {
          console.log('Component did mount!')
          this.getList();
       }
      getList=()=>{
       /*** method to make api call***
       fetch('https://api.mydomain.com')
          .then(response => response.json())
          .then(data => this.setState({ list:data }));
      }
       shouldComponentUpdate(nextProps, nextState){
         return this.state.list!==nextState.list
        }
       componentWillUpdate(nextProps, nextState) {
          console.log('Component will update!');
       }
       componentDidUpdate(prevProps, prevState) {
          console.log('Component did update!')
       }
      render() {
          return (
             <div>
                <h3>Hello Mounting Lifecycle Methods!</h3>
             </div>
          );
       }
}