Question

How to create and use a function that return a value to jsx expression in React JS

Answer 1

// counter.jsx

import React, { Component } from "react";

class Counter extends Component {
  state = {
    total: 757
  };

  render() {
    return (
      <React.Fragment>
        <span>Render Dynamically: {this.getTotal()}</span>
      </React.Fragment>
    );
  }

  getTotal() {
    const { total } = this.state;
    return total === 0 ? <h2>Zero</h2> : total;
  }
}

export default Counter;

// index.js 

import React from 'react';
import ReactDOM from 'react-dom';
import './index.css';
import App from './App';
import * as serviceWorker from './serviceWorker';
import 'bootstrap/dist/css/bootstrap.css';
import Counter from './components/counter'


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

serviceWorker.unregister();


/*
run:
 
Render Dynamically: 757
 
*/

 

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