App.jsx

class App extends React.Component {
  
  constructor() {
    super();
    this.methodA = this.methodA.bind(this);
    this.methodB = this.methodB.bind(this);
    this.methodC = this.methodC.bind(this);
    
  }
  
  componentDidMount() {
    //...
  }
  
  componentDidUpdate() {
    //...
  }
  
  methodA() {
    //...
  }
  
  methodB() {
    //...
  }
    
  methodC() {
    //...
  }
  
  render() {
    //...
  }
  
}