JavaScript Introduction

JavaScript is the most popular web scripting language. It is lightweight, interpreted programming language with object-oriented capabilities. It used for both client side as well as server side development.

=> JavaScript was created by the Brendan Eich.
=> It was first appeared in December 4, 1995.

Why to Learn Javascript

  • JavaScript is the most powerful programming language because it powers the dynamic behavior on most websites.
  • JavaScript can change HTML content
  • JavaScript helps you to create interactive and fast websites.
  • JavaScript reduce the server interaction by doing some frontend work (like form validation).

Example –

Program – Hello World

      <script language = "javascript" type = "text/javascript">
            document.write("Hello World!");

There are several useful JavaScript frameworks and libraries available:

  • JQuery
  • React
  • Angular
  • Node.js
  • Polymer
  • Ext.js
  • Backbone.js
  • Ember.js
  • Vue.js

Applications of Javascript Programming

JavaScript is a widely used programming language both in frontend as well as in backend. Some of the use of JavaScript in applications:

  • Client Side Validation – JavaScript plays very important role in validating the user inputs before it saved or sent to the server.
  • User notification – While visitors active on website, you can show them a notification or message.
  • Manipulating HTML content – Using JavaScript, it becomes very easy to manipulate the HTML content. You can add or remove any HTML tags or data in it.
  • Back-end Data Loading – JavaScript helps to load data asynchronously. It means JS load data in backend even if visitor doing some other processing.
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