What is JavaScript?

What is JavaScript?


Have you ever wondered, what is JavaScript, is it a part of Java, and why is it so popular?😕

I had the same questions, I’ll tell you what I’ve learned, I think it will be helpful if you’re new at this Technology.

I want to highlight these areas,

  • What is JavaScript?
  • What is the difference between java and JavaScript?
  • How does it work?
  • Why is it so popular (Benefits of JS)?

01.What is JavaScript?

JS is the shortened version of JavaScript.

JS is a programing language follows the ECMAScript specification. JS is high-level, often just-in-time compiled, and multi-paradigm. JS contains curly-bracket syntax, dynamic typing, prototype-based object-orientation, and first-class functions.

Lets look at those big words,

  • ECMAScript specification - An organization that creates standards for technologies(European Computer Manufacturers Association).
  • High level language - Programming languages which are designed to simplify computer programming. High-level source code contains easy-to-read syntax that is converted into a low-level language, which can be recognized and run by the CPU.
  • Just-in-time compiled - Compilation is done during execution.
  • Multi-paradigm -  Supporting more than one programming paradigm, in order to allow the most suitable programming style for a task.
  • Dynamic typing - You can go about declaring variables, functions, objects and anything without declaring the type.
  • prototype-based - Style of OOP which reuse existing objects that serve as Prototypes.

JavaScript is a programming language used primarily by Web browsers to create a dynamic web content. It used both on the client-side and server-side that allows you to make web pages interactive. HTML and CSS give structure and style to web pages, JavaScript gives web pages interactive elements that engage with users.

02.Difference between java and JavaScript?

People always confuse JavaScript with java because of this “Java” word. But it’s just a word, there is no connection between java and JavaScript. Yes, they share some common strategies but JavaScript not a part of Java.

Source: https://hackernoon.com/java-vs-javascript-heres-what-you-need-to-know-9b1b708394e2

03.How does it work?

Web applications (search engine) works on the interaction between the user’s device and a remote server. This remote server sends information to the client(user’s machine). Client reads the info and render the requested web pages on screen. 


JavaScript is a client-side scripting language that means to perform a task JS doesn’t required to interact with the server, it can perform the entire task within the client’s machine.
For example : When a power down even though you haven’t got internet connection, still you can navigate within the webpages which already loaded in your memory.

Dynamic features to the web performed by JavaScript:

  • Autocomplete
  • Loading new content or data onto the page without reloading the page
  • Rollover effects and dropdown menus
  • Animating page elements such as fading, resizing or relocating
  • Playing audio and video
  • Validating input from Web forms
  • Repairing browser compatibility issues

04.Why is it So Popular?

How popular is JS? 🤔

  1. JavaScript is the most popular programming language - 71.5%
  2. Java is a far second - 45.4%
  3. Python is on third position - 37.9%

Popularity means that JavaScript is being used in a lot of places and more people (developers) working on JavaScript than other programming languages.

Why is that?

JavaScript benefits :

  • You can build anything and everything with JavaScript
  • JavaScript is in demand
  • Popularity. JavaScript is used everywhere on the web.
  • Faster user experiences
  • Gives the ability to create rich interfaces.
  • Being client-side reduces the demand on the website server
  • JavaScript developers are paid well
  • JS is easy to learn


Today JavaScript the #1 programming language
Stack Overflow Survey 2018


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