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.

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Windows Key Shortcuts

List of common keyboard shortcuts that can be used with the Windows key: (Image by - Sharma Guides | Subham232330) 1. Windows Key + D: Show the Desktop 2. Windows Key + E: Open File Explorer 3. Windows Key + I: Open Settings 4. Windows Key + L: Lock the computer 5. Windows Key + R: Open the Run Dialog 6. Windows Key + S: Open the search bar 7. Windows Key + Tab: Open Task View 8. Windows Key + Ctrl + D: Create a new virtual desktop 9. Windows Key + Ctrl + Left or Right arrow: Switch between virtual desktops 10. Windows Key + M: Minimize all windows 11. Windows Key + Shift + M: Undo minimize all windows 12. Windows Key + Up Arrow: Maximize the current window 13. Windows Key + Down Arrow: Minimize the current window 14. Windows Key + Right Arrow: Snap the current window to the right 15. Windows Key + Left Arrow: Snap the current window to the left 16. Windows Key + P: Project to a second screen 17. Windows Key + Home: Minimize all but the active window 18. Windows Key + ...

Normalization Types in DBMS

Normalization Types in DBMS First Normal Form (1NF) A relation will be 1NF if it contains an atomic value. It states that an attribute of a table cannot hold multiple values. It must hold only single-valued attribute. First normal form disallows the multi-valued attribute, composite attribute, and their combinations. Example: Relation EMPLOYEE is not in 1NF because of multi-valued attribute EMP_PHONE. EMPLOYEE table: EMP_ID EMP_NAME EMP_PHONE EMP_STATE 14 John 7272826385, 9064738238 UP 20 Harry 8574783832 Bihar 12 Sam 7390372389, 8589830302 Punjab The decomposition of the EMPLOYEE table into 1NF has been shown below: EMP_ID EMP_NAME EMP_PHONE EMP_STATE 14 John 7272826385 UP 14 John 9064738238 UP 20 Harry 8574783832 Bihar 12 Sam 7390372389 Punjab 12 Sam 8589830302 Punjab Second Normal Form (2NF) In the 2NF, relational must be in 1NF. In the second normal form, all non-key attributes are fully functional dependent on the primary key Example: Let's assume, a school can ...

Indexing in DBMS

Indexing in DBMS Indexing is used to optimize the performance of a database by minimizing the number of disk accesses required when a query is processed. The index is a type of data structure. It is used to locate and access the data in a database table quickly. Index structure: Indexes can be created using some database columns. The first column of the database is the search key that contains a copy of the primary key or candidate key of the table. The values of the primary key are stored in sorted order so that the corresponding data can be accessed easily. The second column of the database is the data reference. It contains a set of pointers holding the address of the disk block where the value of the particular key can be found. Indexing Methods Ordered indices The indices are usually sorted to make searching faster. The indices which are sorted are known as ordered indices. Example: Suppose we have an employee table with thousands of record and each of which is 10 byte...

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