React - use state in a component (class component)

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In this article, we would like to show you how to use state in React.

Below example presents a class component with state object where we store property values that belong to the component. 

We refer to the state object by using this.state.propertyname (in our case this.state.animal).

Note: When the state changes, the component re-renders.

Runnable example:

// ONLINE-RUNNER:browser;

//Note: Uncomment import lines during working with JSX Compiler.
// import React from react';

class App extends React.Component {
  constructor(props) {
    this.state = {
      animal: 'dog',
      color: 'black'
  render() {
    return (
          animal: = {this.state.animal}, 
          color: = {this.state.color}

const root = document.querySelector('#root');
ReactDOM.render(<App />, root );


Go to this article to see functional component example.

Alternative titles

  1. React - how to use state (class component)
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