username

password

stripe_secret

stripe_publishable

Gain insights into Meteor.js, explore JavaScript concepts, and discover how to build full-stack applications with React integration, email support, and Stripe payment processing.

meteor-docker.tar.gz

CreateMeteorApp

CreateMeteorAppSettingsFile

CreateReactiveApp

RunAppWithAuthentication

RunAppWithInstallation

Meteor.js is a Node.js framework for developing JavaScript applications. It's used to create full-stack applications that use a single language on both the server and client sides. Meteor.js is easy to use and simplifies the development of web applications.

This course will begin by discussing the fundamental concepts of Meteor.js before moving on to refresh the learner's knowledge of some key aspects of JavaScript used in React, another JavaScript framework. Then, through hands-on experience, you will learn how to build a production-grade Meteor.js application with a React frontend. Following that, you'll learn how to set up an SMTP server to send transactional emails and how to integrate Stripe into your Meteor.js application to accept payments.

By the end of this course, you will be able to create a full-stack application from scratch using Meteor.js and feel confident working with MongoDB as well. You will also be able to integrate Stripe into any Meteor.js application you create.

Building Full Stack Applications Using Meteor.js

# `useEffect`

The `useEffect` hook
The `useEffect` hook is a user-defined function in a component that React calls after rendering. The `useEffect` hook is a functional component equivalent of the class-based component methods of `componentDidMount`, `componentDidUpdate`, and `componentWillUnmount` combined. The React `useEffect` hook allows us to perform side effects in a React component. Examples of side effects of React components are **data fetching**, **manual DOM manipulation**, **subscription**, and so on.

Let's see an example below:



import React from 'react';
require('./style.css');

import ReactDOM from 'react-dom';
import App from './app.js';

ReactDOM.render(
  <App />, 
  document.getElementById('root')
);


import React, { useState, useEffect } from 'react';



const App = () => {
    const [count, setCount ] = useState(0);

    useEffect(()=> {
       const p = document.createElement("p");
       p.innerHTML = `You have clicked the button ${count} time(s) from useEffect`
       document.body.appendChild(p);
    });
    
    const clickMe = () => {
      setCount(count + 1)
    }
  
  return (
     <div>
        <p>You have clicked the button {count} time(s) </p>
        <button onClick={clickMe}>Click me</button>
     </div>
  )

}

export default App;




import React from 'react';
import { shallow, configure } from 'enzyme';
import Adapter from 'enzyme-adapter-react-16';

configure({ adapter: new Adapter() });

import HelloWorld from './app';

var TestResult = function() {
    this.succeeded = false;
    this.reason = "";
    this.input = "";
    this.expected_output = "";
    this.actual_output = "";
}

export const executeTests = function() {

  var results = [];

  result = new TestResult();
  result.input = 'HelloWorld Component';
  result.expected_output = "span containing text 'Hello World'"

  let wrapper = shallow(<HelloWorld />);

  // Call your Challenge function here.

  let type = wrapper.type();
  let testSuccessful = true;
  let failureReason;

  if (type !== 'span') {
    testSuccessful = false;
    failureReason = "You need to render exactly one span HTML element";
  } else if (wrapper.props().children != "Hello World") {
     testSuccessful = false;
     failureReason = "You have rendered wrong message in your span element";
  }

  result.actual_output = wrapper.html();

  if (testSuccessful) {
    result.succeeded = true;
    result.reason = "Succeeded"
  } else {
    result.succeeded = false;
    result.reason = failureReason;
  }

  results.push(result);

  return results;
}


React

Dart

GoJS React

Typescript React

Vue.js

On **lines 8–12** , we declare a `useEffect` hook function on the `App` component. This function, as defined, runs when the component is first rendered and on every rerender. The `useEffect` function creates a `p` tag with a message and attaches it to the document body. We can have more than one `useEffect` function in a component. React calls them in the order they are written.

> **Note:** The `useEffect` hook should only be defined in top-level React code. It shouldn’t be defined inside a loop or conditional.

# Types of `useEffect`
There are two types of `useEffect` functions, including an effect that doesn’t require cleanup and one that does.

Let’s see an example of each.


Learn how to perform side effects in React functional components using the useEffect hook.

Getting Started

Meteor Framework

Introduction to MeteorJS

Working With Data

A Pop Quiz On Data Access With Meteor

A Simple Idea Vote Application

JavaScript Refresher

Pop Quiz: JavaScript Refresher for React Development

An Overview of React

Pop Quiz: React

Coding an Online Bookshop

Deployment

Appendix

React Hook: useEffect

`useEffect`