Introduction To ReactJS

Introduction To ReactJS - JavaScript

React JS Intro

(Image by - Sharma Guides | Subham232330)

What is ReactJS?

* ReactJS is a free and open-source JavaScript library for building user interfaces using a component-based concept.

* ReactJS is also known as React, React Js.

* React is maintained by Facebook.

* ReactJS is not a framework, it is a library.

Examples of ReactJS websites:-

Facebook, Discord, Netflix, Dropbox

Advantages of ReactJS

1. DOM Virtuality

2. Easy Testing

3. SEO Friendly

4. Blazing Fast

5. Efficient Debugging

Prerequisites

HTML

CSS

JavaScript

ES6:- let, const, arrow function, classes, object literals, spread operators.

Comments

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SQL Constraints (Image by - Sharma Guides | Subham232330) Constraints | |- CHECK | |- NOT NULL | |- UNIQUE | |- PRIMARY KEY | |- DEFAULT | |- FOREIGN KEY | |- INDEX * These constraints are also known as Integrity Constraints . * SQL Constraints:- Constraints are the rules and restrictions applied to the data in a table. * NOT NULL:- Value cannot be Null in a column. * UNIQUE:- Value cannot be the same in a column. * PRIMARY KEY:- Used to uniquely identify a row. * FOREIGN KEY:- References a row in another table. * CHECK:- Satisfies a specific condition. * DEFAULT:- Set default value. * CREATE INDEX:- Used to speed up the reading process.

Implement Echo client and Echo server using TCP Sockets

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Write a java program which has various types of constructor and overload these constructors when the object is being created of that class.

Write a java program which has various types of constructor and overload these constructors when the object is being created of that class. class variousConstructor { public static void main(String[] args) { constructor c1 = new constructor(); constructor c2 = new constructor(23); constructor c3 = new constructor(45.6); } } class constructor { public constructor() { System.out.println("It's 1st constractor."); } public constructor(int n1) { System.out.println("It's constractor with integer variable which is " + n1); } public constructor(double d1) { System.out.println("it's a constractor with double variable which is " + d1); } public constructor(float f1) { System.out.println("It's a constractor with float variable which is " + f1); } } OUTPUT: It's 1st constractor. it's a constractor with double variable which is 23 It's a constractor with float variable which is 45....

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