React Js Tutorial For Beginners | What Is React Js And Why Use React Js?

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reactjs tutorial

What is React JS?

It's a JavaScript library for creating user interfaces, to put it simply. Let's start with the fundamentals before moving on to the rest of the React JS course. There are two words in this definition: javascript library and user interface. Let's have a look at what these terms signify.

The library is a collection of pre-written code that is efficient, complicated, well-written, and easily accessible. As a result, it simplifies our lives and allows us to use code written by others with ease.

Assume we wish to find the cosine value of 20. Rather of obsessing over how this library was created, we simply use the math library. For instance, Math.cos (20).

The user interface is what the user sees right away.

React JS is a powerful tool that breaks down a page into many building elements known as components, allowing for fast front-end development.

React JS pre-requisites

There are some prerequisites to bear in mind before we plunge into the depths of our React JS Tutorial. We need a fundamental understanding of HTML, CSS, and JavaScript ...
... because these are the cornerstones of any frontend development and are required to become an expert.

1. HTML

(Hypertext Markup Language) is an acronym for Hypertext Markup Language.
It's a markup language used to make web pages and documents.
Tags for Beginners:
div> span>: div> span> is a tag that is used to organise elements.

form>: to create a form that will be used to collect data from users.

input>: specifies what and how users' input should be collected.

button>: creates a button and specifies the functions that will be executed when the button is clicked.

2. CSS
Cascading Style Sheet (CSS) is an acronym for Cascading Style Sheets (CSS).
It's in charge of the website's appearance and feel.
You can apply styling to HTML items that you've selected.

Syntax at a High Level:

selector{
property1 : value1;
property2 : value2;
property3 : value3;
}

CSS has three main selectors: selectors, selectors, and selectors, selectors.

In an HTML document, id(#) is unique.
A group of elements is referred to as a class(.).
-Box Model Tag(tag name) – all tags of a specific tag name

Every constituent is given the shape of a rectangular box.
Four edges make up each box.
Border Padding Padding Padding Padding Padding Padding Padding Padding Padding
Other features, such as colours, fonts, and backgrounds, must also be well-understood.

3, JavaScript
Arrays
Objects
Functions
Control Flow Statements
DOM Manipulation
DOM Events
Closure
Prototype
OOPs
With this in mind, you can ensure that the rest of the React JS Tutorial is clear to you.

Why use React JS?
We can move on to the next level of the React JS tutorial now that you know what React is and why we utilise it.

In front-end development, React is a strong and widely used tool.

React is more popular than Vue and Angular, which are competitors. The fact that React is a library is one of the key reasons for its success. As a result, as compared to Angular, which is a framework, you have more control over the application's flow.

The components that aid in optimization can be easily reused. In comparison to Angular and Vue, React has an extremely low learning curve. React is used by some of the world's most well-known companies, including Facebook, Netflix, PayPal, Tesla, and others.

When we create a single-page application, we can see the full benefits of React. React developers have more job opportunities than Angular developers.

Single Page Application
Multiple server requests were sent with multiple reloading in the traditional system. This resulted in lower performance, increased bandwidth, and increased processing time. Single-page apps, on the other hand, make only one request to the server, and the server responds as the data is re-written.

Components make up the entirety of the web page. Virtual DOM locates the component that needs to be reloaded and updates that item in the actual DOM without reloading all of the webpage's components.

Single-page applications save time and bandwidth while also improving performance. Gmail, Facebook, and Twitter are examples of SPA.

JSX
JavaScript XML is abbreviated as JSX.

It's utilised by React to allow HTM and JavaScript code to coexist.

In the past, we used to include JavaScript in HTML. However, using JSX, you may now use HTML in JavaScript.

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