JavaScript Basics Before You Learn React

JavaScript Basics Before You Learn React

In an ideal world, you can learn all about JavaScript and web development before you dive into React. Unfortunately, we live in a not-perfect world, so chomping down on ALL of JavaScript before React will just make you bleed hard.

If you already have some experience with JavaScript, all you need to learn before React is just the JavaScript features you will actually use to develop React application. Things about JavaScript you should be comfortable with before learning React are:

It’s the 20% of JavaScript features that you will use 80% of the time, so in this tutorial I will help you learn them all.


Exploring Create React App

The usual case of starting to learn React is to run the create-react-app package, which sets up everything you need to run React. Then after the process is finished, opening src/app.js will present us with the only React class in the whole app:

import React, { Component } from 'react';
import logo from './logo.svg';
import './App.css';

class App extends Component {
render() {
return (
<div className="App">
<header className="App-header">
<img src={logo} className="App-logo" alt="logo" />
<p>
Edit <code>src/App.js</code> and save to reload.
</p>
<a
className="App-link"
href="https://reactjs.org"
target="_blank"
rel="noopener noreferrer"
>
Learn React
</a>
</header>
</div>
);
}
}

export default App;

If you never learned ES6 before, you’d think that this class statement is a feature of React. It’s actually a new feature of ES6, and that’s why learning ES6 properly would enable you to understand React code better. We’ll start with ES6 classes.


ES6 Classes

ES6 introduced class syntax that is used in similar ways to OO language like Java or Python. A basic class in ES6 would look like this:

class Developer {
constructor(name){
this.name = name;
}

hello(){
return 'Hello World! I am ' + this.name + ' and I am a web developer';
}
}

class syntax is followed by an identifier (or simply name) that can be used to create new objects. The constructor method is always called in object initialization. Any parameters passed into the object will be passed into the new object. For example:

var nathan = new Developer('Nathan');
nathan.hello(); // Hello World! I am Nathan and I am a web developer

A class can define as many methods as the requirements needed, and in this case, we have the hello method which returns a string.


Class inheritance

A class can extends the definition of another class, and a new object initialized from that class will have all the methods of both classes.

class ReactDeveloper extends Developer {
installReact(){
return 'installing React .. Done.';
}
}

var nathan = new ReactDeveloper('Nathan');
nathan.hello(); // Hello World! I am Nathan and I am a web developer
nathan.installReact(); // installing React .. Done.

The class that extends another class is usually called child class or sub class, and the class that is being extended is called parent class or super class. A child class can also override the methods defined in parent class, meaning it will replace the method definition with the new method defined. For example, let’s override the hello function:

class ReactDeveloper extends Developer {
installReact(){
return 'installing React .. Done.';
}

hello(){
return 'Hello World! I am ' + this.name + ' and I am a REACT developer';
}
}

var nathan = new ReactDeveloper('Nathan');
nathan.hello(); // Hello World! I am Nathan and I am a REACT developer

There you go. The hello method from Developer class has been overridden.


Use in React

Now that we understand ES6 class and inheritance, we can understand the React class defined in src/app.js. This is a React component, but it’s actually just a normal ES6 class which inherits the definition of React Component class, which is imported from the React package.

import React, { Component } from 'react';

class App extends Component {
// class content
render(){
return (
<h1>Hello React!</h1>
)
}
}

This is what enables us to use the render() method, JSX, this.state, other methods. All of this definitions are inside the Component class. But as we will see later, class is not the only way to define React Component. If you don’t need state and other lifecycle methods, you can use a function instead.


Declaring variables with ES6 let and const

Because JavaScript var keyword declares variable globally, two new variable declarations were introduced in ES6 to solve the issue, namely let and const. They are all the same, in which they are used to declare variables. The difference is that const cannot change its value after declaration, while let can. Both declarations are local, meaning if you declare let inside a function scope, you can’t call it outside of the function.

const name = "David";
let age = 28;
var occupation = "Software Engineer";

Which one to use?

The rule of thumb is that declare variable using const by default. Later when you wrote the application, you’ll realize that the value of const need to change. That’s the time you should refactor const into let. Hopefully it will make you get used to the new keywords, and you’ll start to recognize the pattern in your application where you need to use const or let.


When do we use it in React?

Everytime we need variables. Consider the following example:

import React, { Component } from 'react';

class App extends Component {
// class content
render(){
const greeting = 'Welcome to React';
return (
<h1>{greeting}</h1>
)
}
}

Since greeting won’t change in the entire application lifecycle, we define it using const here.


The arrow function

Arrow function is a new ES6 feature that’s been used almost widely in modern codebases because it keeps the code concise and readable. This feature allows us to write functions using shorter syntax

// regular function
const testFunction = function() {
// content..
}

// arrow function
const testFunction = () => {
// content..
}

If you’re an experienced JS developer, moving from the regular function syntax to arrow syntax might be uncomfortable at first. When I was learning about arrow function, I used this simple 2 steps to rewrite my functions:

  1. remove function keyword
  2. add the fat arrow symbol => after ()

the parentheses are still used for passing parameters, and if you only have one parameter, you can omit the parentheses.

const testFunction = (firstName, lastName) => {
return firstName+' '+lastName;
}

const singleParam = firstName => {
return firstName;
}

Implicit return

If your arrow function is only one line, you can return values without having to use the return keyword and the curly brackets {}

const testFunction = () => 'hello there.';
testFunction();

Use in React

Another way to create React component is to use arrow function. React take arrow function:

const HelloWorld = (props) => {
return <h1>{props.hello}</h1>;
}

as equivalent to an ES6 class component

class HelloWorld extends Component {
render() {
return (
<h1>{props.hello}</h1>;
);
}
}

Using arrow function in your React application makes the code more concise. But it will also remove the use of state from your component. This type of component is known as stateless functional component. You’ll find that name in many React tutorials.


Destructuring assignment for arrays and objects

One of the most useful new syntax introduced in ES6, destructuring assignment is simply copying a part of object or array and put them into named variables. A quick example:

const developer = {
firstName: 'Nathan',
lastName: 'Sebhastian',
developer: true,
age: 25,
}

//destructure developer object
const { firstName, lastName } = developer;
console.log(firstName); // returns 'Nathan'
console.log(lastName); // returns 'Sebhastian'
console.log(developer); // returns the object

As you can see, we assigned firstName and lastName from developer object into new variable firstName and lastName. Now what if you want to put firstName into a new variable called name?

const { firstName:name } = developer;
console.log(name); // returns 'Nathan'

Destructuring also works on arrays, only it uses index instead of object keys:

const numbers = [1,2,3,4,5];
const [one, two] = numbers; // one = 1, two = 2

You can skip some index from destructuring by passing it with ,:

const [one, two, , four] = numbers; // one = 1, two = 2, four = 4

Use in React

Mostly used in destructuring state in methods, for example:

reactFunction = () => {
const { name, email } = this.state;
};

Or in functional stateless component, consider the example from previous chapter:

const HelloWorld = (props) => {
return <h1>{props.hello}</h1>;
}

We can simply destructure the parameter immediately:

const HelloWorld = ({ hello }) => {
return <h1>{hello}</h1>;
}

Map and filter

Although this tutorial focuses on ES6, JavaScript array map and filter methods need to be mentioned since they are probably one of the most used ES5 features when building React application. Particularly on processing data.

These two methods are much more used in processing data. For example, imagine a fetch from API result returns an array of JSON data:

const users = [
{ name: 'Nathan', age: 25 },
{ name: 'Jack', age: 30 },
{ name: 'Joe', age: 28 },
];

Then we can render a list of items in React as follows:

import React, { Component } from 'react';

class App extends Component {
// class content
render(){
const users = [
{ name: 'Nathan', age: 25 },
{ name: 'Jack', age: 30 },
{ name: 'Joe', age: 28 },
];

return (
  &lt;ul&gt;
    {users
      .map(user =&gt; &lt;li&gt;{user.name}&lt;/li&gt;)
    }
  &lt;/ul&gt;
)

}
}

We can also filter the data in the render.

<ul>
{users
.filter(user => user.age > 26)
.map(user => <li>{user.name}</li>)
}
</ul>

ES6 module system

The ES6 module system enables JavaScript to import and export files. Let’s see the src/app.js code again in order to explain this.

import React, { Component } from 'react';
import logo from './logo.svg';
import './App.css';

class App extends Component {
render() {
return (
<div className="App">
<header className="App-header">
<img src={logo} className="App-logo" alt="logo" />
<p>
Edit <code>src/App.js</code> and save to reload.
</p>
<a
className="App-link"
href="https://reactjs.org"
target="_blank"
rel="noopener noreferrer"
>
Learn React
</a>
</header>
</div>
);
}
}

export default App;

Up at the first line of code we see the import statement:

import React, { Component } from 'react';

and at the last line we see the export default statement:

export default App;

To understand these statements, let’s discuss about modules syntax first.

A module is simply a JavaScript file that exports one or more values (can be objects, functions or variables) using the export keyword. First, create a new file named util.js in the src directory

touch util.js

Then write a function inside it. This is a default export

export default function times(x) {
return x * x;
}

or multiple named exports

export function times(x) {
return x * x;
}

export function plusTwo(number) {
return number + 2;
}

Then we can import it from src/App.js

import { times, plusTwo } from './util.js';

console.log(times(2));
console.log(plusTwo(3));

You can have multiple named exports per module but only one default export. A default export can be imported without using the curly braces and corresponding exported function name:

// in util.js
export default function times(x) {
return x * x;
}

// in app.js
import k from './util.js';

console.log(k(4)); // returns 16

But for named exports, you must import using curly braces and the exact name. Alternatively, imports can use alias to avoid having the same name for two different imports:

// in util.js
export function times(x) {
return x * x;
}

export function plusTwo(number) {
return number + 2;
}

// in app.js
import { times as multiplication, plusTwo as plus2 } from './util.js';

Import from absolute name like:

import React from 'react';

Will make JavaScript check on node_modules for the corresponding package name. So if you’re importing a local file, don’t forget to use the right path.


Use in React

Obviously we’ve seen this in the src/App.js file, and then in index.js file where the exported App component is being rendered. Let’s ignore the serviceWorker part for now.

//index.js file

import React from 'react';
import ReactDOM from 'react-dom';
import './index.css';
import App from './App';
import * as serviceWorker from './serviceWorker';

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

// If you want your app to work offline and load faster, you can change
// unregister() to register() below. Note this comes with some pitfalls.
// Learn more about service workers: http://bit.ly/CRA-PWA
serviceWorker.unregister();

Notice how App is imported from ./App directory and the .js extension has been omitted. We can leave out file extension only when importing JavaScript files, but we have to include it on other files, such as .css. We also import another node module react-dom, which enables us to render React component into HTML element.

As for PWA, it’s a feature to make React application works offline, but since it’s disabled by default, there’s no need to learn it in the beginning. It’s better to learn PWA after you’re confident enough building React user interfaces.


Conclusion

The great thing about React is that it doesn’t add any foreign abstraction layer on top of JavaScript as other web frameworks. That’s why React becomes very popular with JS developers. It simply uses the best of JavaScript to make building user interfaces easier and maintainable. There really is more of JavaScript than React specifix syntax inside a React application, so once you understand JavaScript better — particularly ES6 — you can write React application with confident. But it doesn’t mean you have to master everything about JavaScript to start writing React app. Go and write one now, and as opportunities come your way, you will be a better developer.

Thanks for reading and I hope you learned some new things :)


Learn More

The Complete JavaScript Course 2019: Build Real Projects!

Become a JavaScript developer - Learn (React, Node,Angular)

JavaScript: Understanding the Weird Parts

Vue JS 2 - The Complete Guide (incl. Vue Router & Vuex)

The Full JavaScript & ES6 Tutorial - (including ES7 & React)

JavaScript - Step By Step Guide For Beginners

The Web Developer Bootcamp

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The Complete React Web Developer Course (2nd Edition)

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What is JavaScript – All You Need To Know About JavaScript

What is JavaScript – All You Need To Know About JavaScript

In this article on what is JavaScript, we will learn the basic concepts of JavaScript.

After decades of improvement, JavaScript has become one of the most popular programming languages of all time. It all started in the year 1995 when Brendan Eich created JavaScript in a span of 10 days. Since then, it has seen multiple versions, updates and has grown to the next level.

Here’s a list of topics that I’ll be covering in this blog:

  1. What is JavaScript
  2. What can JavaScript do?
  3. JavaScript Frameworks
  4. The Big Picture: HTML, CSS & JavaScript
  5. Benefits of JavaScript
  6. Fundamentals of JavaScript
    VariablesConstantsData TypesObjectsArraysFunctionsConditional statementsLoopsSwitch case
What is JavaScript?

JavaScript is a high level, interpreted, programming language used to make web pages more interactive.

Have you ever thought that your website is missing something? Maybe it’s not engaging enough or it’s not as creative as you want it to be. JavaScript is that missing piece which can be used to enhance web pages, applications, etc to provide a more user-friendly experience.

What is JavaScript?

JavaScript is the language of the web, it is used to make the web look alive by adding motion to it. To be more precise, it’s a programming language that let’s you implement complex and beautiful things/design on web pages. When you notice a web page doing more than just sit there and gawk at you, you can bet that the web page is using JavaScript.

Feature of JavaScript

Scripting language and not Java: In fact, JavaScript has nothing to do with Java. Then why is it called “Java” Script? When JavaScript was first released it was called Mocha, it was later renamed to LiveScript and then to JavaScript when Netscape (founded JavaScript) and Sun did a license agreement. Object-based scripting language which supports polymorphism, encapsulation and to some extent inheritance as well.**Interpreted language: **It doesn’t have to be compiled like Java and C which require a compiler.JavaScript runs in a browser: You can run it on Google Chrome, Internet Explorer, Safari, etc. JavaScript can execute not only in the browser but also on the server and any device which has a JavaScript Engine.

What is JavaScript – Stackoverflow stats

Currently, we have 100s of programming languages and every day new languages are being created. Among these are few powerful languages that bring about big changes in the market and JavaScript is one of them.

JavaScript has always been on the list of popular programming languages. According to StackOverflow, for the 6th year in a row, JavaScript has remained the most popular and commonly used programming language.

What can JavaScript do?

JavaScript is mainly known for creating beautiful web pages & applications. An example of this is Google Maps. If you want to explore a specific map, all you have to do is click and drag with the mouse. And what sort of language could do that? You guessed it! It’s JavaScript.JavaScript can also be used in smart watches. An example of this is the popular smartwatch maker called Pebble. Pebble has created Pebble.js which is a small JavaScript Framework that allows a developer to create an application for the Pebble line of watches in JavaScript.

What is JavaScript – Applications of JavaScript
Most popular websites like Google, Facebook, Netflix, Amazon, etc make use of JavaScript to build their websites.Among things like mobile applications, digital art, web servers and server applications, JavaScript is also used to make Games. A lot of developers are building small-scale games and apps using JavaScript.## JavaScript Frameworks

One major reason for the popularity of JavaScript is the JavaScript Frameworks. Here’s a brief introduction of the most trending JavaScript frameworks :

  1. AngularJS is Google’s web development framework which provides a set of modern development and design features for rapid application development.

  2. ReactJS is another top JavaScript framework mainly maintained by Facebook and it’s behind the User Interface of Facebook and Instagram, showing off its efficiency in maintaining such high traffic applications.

What is JavaScript – JavaScript Frameworks

  1. MeteorJS is mainly used for providing back-end development. Using JavaScript on the back-end to save time and build expertise is one of the major ideas behind Meteor.

  2. jQuery can be used when you want to extend your website and make it more interactive. Companies like Google, WordPress and IBM rely on jQuery.

The Big Picture: HTML, CSS & JavaScript

Anyone familiar with JavaScript knows that it has something to do with HTML and CSS. But what is the relationship between these three? Let me explain this with an analogy.

What is JavaScript – HTML, CSS and JavaScript

Think of HTML (HyperText Markup Language) as the skeleton of the web. It is used for displaying the web.

On the other hand, CSS is like our clothes. We put on fashionable clothes to look better. Similarly, the web is quite stylish as well. It uses CSS which stands for Cascading Style Sheets for styling purpose.

Then there is JavaScript which puts life into a web page. Just like how kids move around using the skateboard, the web also motions with the help of JavaScript.

Benefits of JavaScript

There has to be a reason why so many developers love working on JavaScript. Well, there are several benefits of using JavaScript for developing web applications, here’s a few benefits:

It’s easy to learn and simple to implement. It is a weak-type programming language unlike the strong-type programming languages like Java and C++, which have strict rules for coding.

It’s all about being fast in today’s world and since JavaScript is mainly a client-side programming language, it is very fast because any code can run immediately instead of having to contact the server and wait for an answer.

Rich set of frameworks like AngularJS, ReactJS are used to build web applications and perform different tasks.

**Builds interactive websites: **We all get attracted to beautifully designed websites and JavaScript is the reason behind such attractive websites and applications.

JavaScript is an interpreted language that does not require a compiler because the web interprets JavaScript. All you need is a browser like Google Chrome or Internet Explorer and you can do all sorts of stuff in the browser.

JavaScript is platform independent and it is supported by all major browsers like Internet Explorer, Google Chrome, Mozilla Firefox, Safari, etc.

JavaScript Fundamentals

In this What is JavaScript blog, we’ll cover the following basic fundamentals of JavaScript
VariablesConstantsData TypesObjectsArraysFunctionsConditional statementsLoopsSwitch case## Variables

Variable is a name given to a memory location which acts as a container for storing data temporarily. They are nothing but reserved memory locations to store values.

What is JavaScript – Variables

To declare a variable in JavaScript use the ‘let’ keyword. For example:

let age;
age=22;

In the above example, I’ve declared a variable ‘age’ by using the ‘let’ keyword and then I’ve stored a value (22) in it. So here a memory location is assigned to the ‘age’ variable and it contains a value i.e. ’22’.

Constants

Constants are fixed values that don’t change during execution time.

To declare a constant in JavaScript use the ‘const’ keyword. For example:

const mybirthday;
mybirthday='3rd August'; 

Data types

You can assign different types of values to a variable such as a number or a string. In JavaScript, there are two categories of data types :

What is JavaScript – Data Types

Objects

An object is a standalone entity with properties and types and it is a lot like an object in real life. For example, consider a girl, whose name is Emily, age is 22 and eye-color is brown. In this example the object is the girl and her name, age and eye-color are her properties.

What is JavaScript – Objects example

Objects are variables too, but they contain many values, so instead of declaring different variables for each property, you can declare an object which stores all these properties.

To declare an object in JavaScript use the ‘let’ keyword and make sure to use curly brackets in such a way that all property-value pairs are defined within the curly brackets. For example:

let girl= {
name: 'Emily',
age: 22,
eyeColour: 'Brown'
};

In the above example, I’ve declared an object called ‘girl’ and it has 3 properties (name, age, eye colour) with values (Emily, 22, Brown).

Arrays

An array is a data structure that contains a list of elements which store multiple values in a single variable.

For example, let’s consider a scenario where you went shopping to buy art supplies. The list of items you bought can be put into an array.

What is JavaScript – Arrays example

To declare an array in JavaScript use the ‘let’ keyword with square brackets and all the array elements must be enclosed within them. For example:

let shopping=[];
shopping=['paintBrush','sprayPaint','waterColours','canvas'];

In the above example I’ve declared an array called ‘shopping’ and I’ve added four elements in it.

Also, array elements are numbered from zero. For example this is how you access the first array element:

shopping[0];		

Functions

A function is a block of organised, reusable code that is used to perform single, related action.

Let’s create a function that calculates the product of two numbers.

To declare a function in JavaScript use the ‘function’ keyword. For example:

function product(a, b) {
return a*b;
}

In the above example, I’ve declared a function called ‘product’ and I’ve passed 2 parameters to this function, ‘a’ and ‘b’ which are variables whose product is returned by this function. Now, in order to call a function and pass a value to these parameters you’ll have to follow the below syntax:

product(8,2);

In the above code snippet I’m calling the product function with a set of values (8 & 2). These are values of the variables ‘a’ and ‘b’ and they’re called as arguments to the function.

Conditional statements – if

Conditional statement is a set of rules performed if a certain condition is met. The ‘if’ statement is used to execute a block of code, only if the condition specified holds true.

What is JavaScript – if flowchart

To declare an if statement in JavaScript use the ‘if’ keyword. The syntax is:

if(condition) {
statement;
}

Now let’s look at an example:

let numbers=[1,2,1,2,3,2,3,1];
if(numbers[0]==numbers[2]) {
console.log('Correct!');
}

In the above example I’ve defined an array of numbers and then I’ve defined an if block. Within this block is a condition and a statement. The condition is ‘(numbers[0]==numbers[2])’ and the statement is ‘console.log(‘Correct!’)’. If the condition is met, only then the statement will be executed.

Conditional statements- Else if

Else statement is used to execute a block of code if the same condition is false.

What is JavaScript – Else-if flowchart

The syntax is:

if(condition) {
statement a;
}
else (condition) {
statement b;
}

Now let’s look at an example:

let numbers=[1,2,1,2,3,2,3,1];
if(numbers[0]==numbers[4] {
console.log("Correct!");
}
else {
console.log("Wrong, please try again");
}

In the above example, I’ve defined an if block as well as an else block. So if the conditions within the if block holds false then the else block gets executed. Try this for yourself and see what you get!

**Loops **

Loops are used to repeat a specific block until some end condition is met. There are three categories of loops in JavaScript :

  1. while loop
  2. do while loop
  3. for loop
While loop

While the condition is true, the code within the loop is executed.

What is JavaScript – while loop flowchart

The syntax is:

while(condition) {
loop code;
}

Now let’s look at an example:

let i=0;
while(i < 5) {
console.log("The number is " +i);
i++;
}

In the above example, I’ve defined a while loop wherein I’ve set a condition. As long as the condition holds true, the while loop is executed. Try this for yourself and see what you get!

Do while loop

This loop will first execute the code, then check the condition and while the condition holds true, execute repeatedly.

What is JavaScript – Do while loop flowchart

Refer the syntax to better understand it:

do {
loop code;
} while(condition);

This loop executes the code block once before checking if the condition is true, then it will repeat the loop as long as the condition holds true.

Now let’s look at an example:

do {
console.log("The number is " +i);
i++;
}
while(i > 5);

The above code is similar to the while loop code except, the code block within the do loop is first executed and only then the condition within the while loop is checked. If the condition holds true then the do loop is executed again.

For loop

The for loop repeatedly executes the loop code while a given condition is TRUE. It tests the condition before executing the loop body.

What is JavaScript – for loop flowchart

The syntax is:

for(begin; condition; step) {
loop code;
}

In the above syntax:

  • begin statement is executed one time before the execution of the loop code
  • condition defines the condition for executing the loop code
  • step statement is executed every time after the code block has been executed

For example:

for (i=0;i<5;i++) {
console.log("The number is " +i);
}

In the above example, I’ve defined a for loop within which I’ve defined the begin, condition and step statements. The begin statement is that ‘i=0’. After executing the begin statement the code within the for loop is executed one time. Next, the condition is checked, if ‘i<5’ then, the code within the loop is executed. After this, the last step statement (i++) is executed. Try this and see what you get!

Switch Case

The switch statement is used to perform different actions based on different conditions.

What is JavaScript – Switch case flowchart

Let’s look at the syntax for switch case:

switch(expression) {
case 1:
code block 1
break;
case 2:
code block 2
break;
default:
code block 3
break;
}

How does it work?

  • Switch expression gets evaluated once
  • Value of the expression is compared with the values of each case
  • If there is a match, the associated block of code is executed

Let’s try this with an example:

let games='football';
switch(games) {
case "throwball":
console.log("I dislike throwball!");
break;
case "football":
console.log("I love football!");
break;
case "cricket":
console.log("I'm a huge cricket fan!");
break;
default:
console.log("I like other games");
break;
}

In the above example the switch expression is ‘games’ and the value of games is ‘football’. The value of ‘games’ is compared with the value of each case. In this example it is compared to ‘throwball’, ‘cricket’ and ‘football’. The value of ‘games’ matches with the case ‘football’, therefore the code within the ‘football’ case is executed. Try this for yourself and see what you get!

With this, we come to the end of this blog. I hope you found this blog informative and I hope you have a basic understanding of JavaScript. In my next blog on JavaScript I’ll be covering in-depth concepts, so stay tuned.

Also, check out our video on JavaScript Fundamentals if you want to get started as soon as possible and don’t forget to leave a comment if you have any doubt and also, let us know whether you’d want us to create more content on JavaScript. We are listening!

Why ReactJS is better for Web Application Development?

Why ReactJS is better for Web Application Development?

Web Application Development is the point of contact for a business in today's digital era. It is important to choose the right platform for Web Application Development to build a high end Web

Web Application Development is essential for a business in today’s digital era. Finding the right platform for Web Application Development is important for building an effective Web Application that can enhance the overall customer engagement. Here’s what makes ReactJS a better option for building your next Web Application.