[Code Example] Using constructor in class component reactjs


React components can have state by setting this.state in their constructors. this.state should be considered as private to a React component that it’s defined in. In this article we are going to show a code example using constructor in class component in react js –

class Square extends React.Component {
  constructor(props) {
    this.state = {
      value: null,

  render() {
    return (
      <button className="square" onClick={() => console.log('click')}>

Source: Reactjs Docs

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