What is JavaScript? and what are the uses of JavaScript?

What is JavaScript?

 JavaScript is a powerful scripting language that can be added with HTML to make a web page more interactive.

 JavaScript was created by Brendan Eich at Netscape in 1995. Its name was Livescript, which was later changed to JavaScript.

 Many programmers consider Javascript and Java to be related to each other but in reality these two are completely different from each other and there is no relation between them.  While Java is a very complex programming language, Javascript is only a light-weighted scripting language.

 Javascript is a client side scripting as well as a server side language.

What are the uses of JavaScript?

 It is used to create an interactive website.  It is mostly used to perform some of these types of tasks:

 Form Validation: While taking input on any form by the user, to verify whether the entered data is in the correct format or not like email, mobile no.  Etcetera.

 Popup Windows: Popups like alert dialog box, confirm dialog box etc. can also be created with JavaScript.

Drop Down Menu: Dynamic drop down menu can be created for the website.

Image Slider: To make the website beautiful, you can also create image slider with the help of JavaScript.

Animation: It is also used to animate website elements and add different animation effects.

Autocomplete: You must have seen on Google, when we type something in the text box, suggestions start appearing below it.  These are the kinds of things you can create with JavaScript.

Browser Detection: You can find out which browser the user is using.

Cookies: Some information can be stored in the user’s browser and can be accessed when the user visits again. This information is called cookies.

Which tools are required for JavaScript?

 There is no need for any special tool to code JavaScript and run it, for this only two things should be in your system:

 Code Editor: You can use a normal text editor like notepad to write code or you can use any of the code editors like Notepad++, Dreamweaver, Sublime, Brackets etc.

 Browser: You can use any modern web browser like Chrome, Firefox, Safari etc.

What are the benefits of JavaScript :

 Fast Execution: It is fast because it runs on the client side and does not require much server interaction.

 Cross Platform: It can work easily in any operating system and any modern browser like Chrome, Firefox, Internet Explorer etc.

 Easy to Learn: This language is very simple and it is very easy to learn.  Its code syntax is very simple and it is like Java and C language.

 Interoperability: JavaScript can be mixed with any other programming language and scripts.  It can be inserted in any type of file.

 Event-Based Programming: With JavaScript, you can create programs that execute when a particular event occurs like button click, mouse hover, etc.

 Procedural programming: Procedural programming features like branching, looping, conditioning etc. are also present in JavaScript.

 Popularity: According to the Popularity of Programming Language Index (PYPL), it is at third place after Python and Java in the list of popular programming languages in November 2020.  After the arrival of Node.js, its use as backend programming is continuously increasing.

Disadvantages of JavaScript:

 Security Issues: As you know that it is executed on the client’s browser, hence it is not very secure, however, keeping security in mind, some restrictions have been imposed in JavaScript such as it cannot read or write the files of the user’s system.  Can do  Despite these restrictions, some malicious codes may still run.

 Javascript rendering varies: It may work differently on different browsers, meaning its outputs are not yet consistent across platforms.

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