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COMPUTER SOFTWARE APPLICATION - CITS

MODULE 3 : Introduction to JavaScript

LESSON 37 - 46 : Introduction to JavaScript

Objectives

At the end of this lesson, you will be able to:
• write clean & maintainable code using methods in javascript
• create & develop web pages using javascript
• create interactive features without slowing down the web page.

What is JavaScript ?
JavaScript is a lightweight, cross-platform, single-threaded, and interpreted compiled programming language. It
is also known as the scripting language for webpages. It is well-known for the development of web pages, and
many non-browser environments also use it.

JavaScript is a weakly typed language (dynamically typed). JavaScript can be used for Client-side developments
as well as Server-side developments. JavaScript is both an imperative and declarative type of language.
JavaScript contains a standard library of objects, like Array, Date, and Math, and a core set of language elements
like operators, control structures, and statements

• Client-side: It supplies objects to control a browser and its Document Object Model (DOM). Like if
client-side extensions allow an application to place elements on an HTML form and respond to user events
such as mouse clicks, form input, and page navigation. Useful libraries for the client side are AngularJS,
ReactJS, VueJS, and so many others.

• Server-side: It supplies objects relevant to running JavaScript on a server. For if the server-side extensions
allow an application to communicate with a database, and provide continuity of information from one invocation
to another of the application, or perform file manipulations on a server. The useful framework which is the most
famous these days is node.js.
• Imperative language – In this type of language we are mostly concerned about how it is to be done. It simply
controls the flow of computation. The procedural programming approach, object, oriented approach comes
under this as async await we are thinking about what is to be done further after the async call.

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