Manage Updates with Lifecycle Methods?

Manage Updates with Lifecycle Methods?
0

#1

I can’t see what is going wrong here, perhaps someone else can. I am getting an error of : Cannot read property ‘toString’ of undefined.

class Dialog extends React.Component {
  constructor(props) {
    super(props);
  }
  componentWillUpdate() {
    console.log('Component is about to update...');
  }
  // change code below this line
  componentWillReceiveProps(nextProps){
    console.log(this.props, nextProps);
  }
  conponentDidUpdate(){
    console.log("Component has updated");
  }
  // change code above this line
  render() {
    return <h1>{this.props.message}</h1>
  }
};

class Controller extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      message: 'First Message'
    };
    this.changeMessage = this.changeMessage.bind(this);
  }
  changeMessage() {
    this.setState({
      message: 'Second Message'
    });
  }
  render() {
    return (
      <div>
        <button onClick={this.changeMessage}>Update</button>
        <Dialog message={this.state.message}/>
      </div>
    );
  }
};

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36.

Link to the challenge:
https://learn.freecodecamp.org/front-end-libraries/react/manage-updates-with-lifecycle-methods


#2

You have a slight typo here.