react passing variable to component code example

Example 1: pass props in react

/* PASSING THE PROPS to the 'Greeting' component */
const expression = 'Happy';
<Greeting statement='Hello' expression={expression}/> // statement and expression are the props (ie. arguments) we are passing to Greeting component

/* USING THE PROPS in the child component */
class Greeting extends Component {
  render() {
    return <h1>{this.props.statement} I am feeling {this.props.expression} today!</h1>;
  }
}

Example 2: class component params in react

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

Example 3: react pass parameter to component

import React, { Component } from 'react'; class App extends Component {  render() {    return (      <div>        <Greeting />      </div>    );  }} class Greeting extends Component {  render() {    const greeting = 'Welcome to React';     return <h1>{greeting}</h1>;  }} export default App;