What is JavaScript?

It is the most popular programming language of HTML and the Web. It is an object-based scripting language which is lightweight and cross-platform. It is used to create client-side dynamic pages.

The programs in JavaScript language are called scripts. It enables interactive web pages and is an essential part of web applications. Major web browsers have a dedicated JavaScript engine to execute it. As a multi-paradigm language, it supports event-driven, functional, and imperative programming styles.

It was introduced in September 1995, which was initially called Mocha. However, after gaining popularity as the best scripting tool, it was renamed as JavaScript to reflect Netscape’s support of Java within its browser. In November 1996, Netscape submitted JavaScript to ECMA. The current version of JavaScript is ECMAScript 2018, which was released in June 2018.

What is TypeScript?

It is latest open source language developed by Microsoft. It is superset of JavaScript. It is designed by Anders Hejlsberg, a designer of C# at Microsoft. It is licensed under Apache 2.

It is originated to deal with complex code of JavaScript while developing large scale of applications. TypeScript supports static typing, classes, interface, functions and variables like OOPs features as per the ECMA-262 language standard. It was first introduced in 2012 and latest version is 3.7.3 released in December 2019.

Advantages of TypeScript as compared to JavaScript

  • TypeScript is an object oriented programming language which makes our code more consistence, clean, simple and reusable. So it should better to use type script for developing large scale project.
  • TypeScript always highlights errors at compilation time during the time of development, whereas JavaScript points out errors at the runtime.
  • TypeScript supports strongly typed or static typing, whereas this is not in JavaScript.
  • TypeScript runs on any browser or JavaScript engine.
  • Great tooling supports with IntelliSense which provides active hints as the code is added.
  • It has a namespace concept by defining a module.
  • JavaScript is used in development for enhancing HTML pages in an interactive and design fashion. It used, particularly on the client-side. But Typescript may be used to develop a JavaScript application for both client-side and server-side.
  • JavaScript cannot be used for a network application, because it doesn’t have such support available.

Disadvantages of Using TypeScript as compared to JavaScript

  • TypeScript takes a long time to compile the code.
  • TypeScript does not support abstract classes.
  • If we run the TypeScript application in the browser, a compilation step is required to transform TypeScript into JavaScript.
  • It should be used for relatively small coding projects.
  •  JavaScript does not require costly development tools, you can start with a simple text editor such as notepad. Since it is an interpreted language inside a web browser, so you don’t even need to buy a compiler.


Author – Nisarg Rami

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