How to Manage State in React

How to Manage State in React

When it comes to manage the state in a React component there are a few ways to do it. React code is made of entities called components. The State of a component is a set of methods to manage what is happening inside of it. Components can be rendered to a particular element in the DOM using the React DOM library

When it comes to manage the state in a react component there are a few ways to do it. So first we are going to define what is a state and a component

React code is made of entities called components. Components can be rendered to a particular element in the DOM using the React DOM library. When rendering a component, one can pass in values that are known as β€œprops”

The State of a component is a set of methods to manage what is happening inside of it. For example you have the method ComponentWillMount() that executes when the component gets rendered and let you write code to make an API call when the component gets rendered or assign some data to the component.

This are the methods available :

Method you can return a Boolean value that specifies whether React should continue with the rendering or not.

shouldComponentUpdate() {
    return false;
  }

Method is called when the component is about to be removed from the DOM.

componentWillUnmount() {

  }

Method is called when the component is about to be removed from the DOM.

componentWillUnmount() {

  }

Method is called before anything else, when the component is initiated, and it is the natural place to set up the initial state and other initial values.

constructor(props) {
    super(props);
    this.state = {favoritecolor: "red"};

 }

Method is called right before rendering the element(s) in the DOM.

getDerivedStateFromProps(props, state) {

  }

Method is called after the component is updated in the DOM.

componentDidUpdate() {
}

This way to manage state in react was with a class-based component, to know if you are using a class-based component you have to check how you declare the component. For example

class Header extends React.Component {
  constructor(props) {
    super(props);
    this.state = {favoritecolor: "red"};
  }
  render() {
    return (
      <h1>My Favorite Color is {this.state.favoritecolor}</h1>
    );
  }
}

This is a class-based component because it starts with class and has a constructor and a render method. Here to use the state you have to use the keyword this to refer the component and then de property state. To initiate the state you can do it inside the constructor or inside the component.

class Header extends React.Component {
  constructor(props) {
    super(props);
    this.state = {count: 0};
  }
 **** render() {
    return (
      <button onClick={() => this.setState({count:count+1})}>The count is {this.state.count}</button>
    );
  }
}

So we explain how manage the state in a class-based component but there are two primary ways of declaring components in React is via functional components and class-based components.

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