define function in react function component code example

Example 1: class app extends component syntax

class Welcome extends React.Component {
  render() {
    return <h1>Hello, {this.props.name}</h1>;
  }
}

Example 2: functional component react

function Welcome(props) {
  return <h1>Hello, {props.name}</h1>;
}

function App() {
  return (
    <div>
      <Welcome name="Sara" />      <Welcome name="Cahal" />      <Welcome name="Edite" />    </div>
  );
}

ReactDOM.render(
  <App />,
  document.getElementById('root')
);

Example 3: react functional components

const component = () => {
console.log("This is a functional Component");
}

Example 4: defining functions in react

export default class Archive extends React.Component { 

    saySomething(something) {
        console.log(something);
    }

    handleClick(e) {
        this.saySomething("element clicked");
    }

    componentDidMount() {
        this.saySomething("component did mount");
    }

    render() {
        return <button onClick={this.handleClick.bind(this)} value="Click me" />;
    }
}

Example 5: class component params in react

<input 
		type= "text"
     	value={ this.state.value || "" }
     	placeholder="Enter Name"
/>

Example 6: react function component

function Welcome(props) {
  return <h1>Hello, {props.name}</h1>;
}