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Typescript Vs Javascript

Typescript Vs Javascript

April 11th, 2019

Typescript Vs Javascript

Whether you are a web designer, web developer, an application developer, a software engineer or any other expert associated with handling programming language, it is essential for you to stay aware with key aspects of JavaScript and TypeScript both.


TypeScript is the superset of JavaScript and it is an open-source type of programming language by Microsoft. Even it adds optional-based static typing to the programming language.
TypeScript is also useful to develop both server-side and client-side JavaScript applications. Any TypeScript program includes functions, modules, variables, expressions, statements and comments.
It is basically a kind of JavaScript development language (programming), emerged as an advanced package in modern times. By virtue of this, the JavaScript code has become lucid and simple as it is statically compiled.
The Typescript can be run on any browser, especially Nodejs that supports ECMAScript3 or any other current version. The optional static typing, classes and interface are basic elements of a Typescript language. If you venture for a large scale JavaScript project, Typescript will enable you to lay hand to more robust software which is easily adaptable to a usual JavaScript application.


JavaScript is a multiple paradigm and a prototype based dynamic scripting language for web pages. It supports imperative, oriented and declarative i.e. functional programming styles.
It is a scripting language by nature through which interactive web pages can be created. JavaScript is used for client-side programming so it does not require the resources from the web server. It runs in the user’s web browser independently.
JavaScript can be used with other technologies such as REST APIs, XML and so on. This particular script has been developed with a view to making it a complementary scripting language. To cite an instance, you know what visual basic is to C++ in Microsoft clan. JavaScript, however, is not slated for large and complex applications. It is only designed for applications with bare minimum lines of code.

Why TypeScript

1. TypeScript has its strong aspect as tooling and hence, it provides navigation, advanced level of auto-completion and refactoring tools, all of which are very much essential to deal with big projects.
2. Another positive aspect associated with TypeScript is that it provides users with an optional-based static type system. Accordingly, you may add types to functions, variables, properties and many more. This will help any compiler and show warnings about any type of potential error in the coding procedure before users run any app.
3. TypeScript is useful in case of both frameworks and libraries, as they help developers to identify the expectation related to type or form of data APIs.
4. A prime benefit associated with TypeScript is that it has specific code completion as well as IntelliSense. Intellisense is responsible to provide active hints while you add codes. As Ionic Itself is available in TypeScript, editors are able to present each of the available methods and everything exactly they expect in the form of arguments.
5. TypeScript has type interference, because of which it is able to give specific types benefits even without using them.
6. One can operate TypeScript on almost every device, browser or in the operating system.
7. Probability of messy codes increases whenever developers involve in handling any big coding project. Simultaneously, you find increase in numbers of errors, which make handling of code even more difficult. Positively, web developers have the safety feature of TypeScript to detect errors at the time of writing codes, which not only boost the code efficiency, but also facilitate for easy debugging process.
8. With the help of TypeScript, you as a developer may use an already existing JavaScript code, include popular JS libraries and may call from any other JS code.

Why JavaScript

1. JavaScript is one of the lightweight programming languages used primary in various web pages to add interactivity.
2. You will find texts in web pages and later on, a few more texts followed by hyperlinks and related images.
3. To make any web page interactive, JavaScript is essential. For instance, you require JS to let the size of written web text to enlarge whenever any user moves his/her mouse.
4. JavaScript is also useful to change of the text color or color of any button while user clicks on it or validates input.
5. JavaScript fills any web page data dynamically, like for instance drop-down list for any state or country.
6. JavaScript is responsible to tell web about the necessary instructions require to follow on any client computer device.
7. JavaScript comes with easy syntaxes, which are flexible for web developers. You can easily test small bit of JS code on any Console Panel while the web browser interpret the result of return output.
8. JavaScript helps you with client-side execution and accordingly, regardless from where you opt to host it, you may execute it always on the client environment. In this way, JS not only saves bandwidth, but also facilitates the fastest possible execution.
9. A prime benefit of JavaScript is that it is perfect to support almost every type of modern browser to display the same outcome.

Where they stand


  • It supports JS libraries and API documentation.
  • It is a superset of JavaScript.
  • The scripting language (Typed) is at the user’s discretion.
  • Conversion is possible i.e., Typescript code can be translated into plain JavaScript
  • It helps in better code structuring and target specific programming techniques.
  • Makes way for improved developmental time tool support.
  • It can extend the language beyond the Standard Decorators, and the syntax viz., async/await.


  • It is an open source project with Microsoft’s patronage.
  • Ideally suited tool for small scripting languages.
  • It supports classes, interfaces and modules.
  • A compiled JavaScript is compatible with any browser.
  • Cross-compilation is possible.
  • JavaScript can be extended for writing large scale apps.

A look back


  • The Typescript first stole the limelight in the year 2012.
  • A new version viz., Typescript 0.9 was released in 2013 post 2 years of internal research at Microsoft.
  • Additional support for generics Typescript 1.0 Build was released in 2014.
  • A Typescript Compiler was introduced in July 2014 which was 5 times faster than the previous versions.
  • Support for E56 modules, featuring Namespace Keyword, For..Of Support, Decorators, was launched in July 2015.
  • More features were added in November 2016. These included Key and Lookup Types, Mapped Types and Rest.
  • More supporting elements have been incorporated in the Typescript recently i.e., on 27th March 2018. These items comprise of Conditional Types, the Improved Key with Intersection Types.


JavaScript was created by Brendan Eich, a programmer from Netscape Communications Corporation to enable him to work on Netscape Navigator. This invention made JavaScript so popular a scripting tool that it had become LiveScript and adopted by all stakeholders. Afterwards, it was renamed as JavaScript in recognition of Netscape’s utilization of Java programming within its own browser.
Following are the pointwise significant progress in the history of JavaScript :

  • Launched in September 1995 and within 10 days, this e scripting language was ready to function. Initially, it was called Mocha.
  • There was a significant development in 1996 when Netscape parted with the rights of JavaScript and ECMA International (European Computer Manufacturers Association) took over.
  • ECMAScript 2 was released in 1998.
  • ECMAScript 3 was released in 1999.
  • 2005 was a year of turn around. ECMA was joined by Eich and Mozilla and they subsequently developed E4X JavaScript.
  • In January 2009, the Common JS project was launched with a view to defining a Common Standard Library.
  • ECMAScript 5.1 was released in June 2011.
  • ECMAScript 2016. was released in June 2015.
  • Nowadays, we are using the current version of ECMAScript 2017 (released in June 2017).

Inherent features


  • Maintainability
  • Developers’ productivity recognized
  • Code navigation and bug prevention
  • Code Discoverability and Refactoring
  • Optional Static Type Annotation/Static Typing
  • Added functions to facilitate the user
  • It supports ES
  • Supports interfaces, subinterfaces, classes and subclasses
  • Development of Scalable HTML5 (client side)
  • Rich IDE included with Autocomplete and Code Navigation features
  • Class-based and Object-oriented with Inheritance of private members and interfaces.

Difference between JavaScript and TypeScript


TypeScript JavaScript

Programming Language

TypeScript is a type of object oriented programming language.

JavaScript is a type of scripting programming language.


TypeScript contains Static typing feature.

JavaScript has dynamic typing feature.

Modules Support

TypeScript is responsible to support different modules and functions.

JavaScript is unable to give support to any module.


TypeScript has a particular interface.

JavaScript does not contain any interface.


You should possess good knowledge and command on Object Oriented Programming, JavaScript and knowledge about ES6.

You only require familiarity with CSS and HTML.

Optional Parameter Function

TypeScript is responsible to support the optional parameter function.

JavaScript fails to support the optional parameter function.


The powerful Type system, including Generics and JS features

Light sized, able to interpret and Object-oriented language with simple functions

Data Binding

Typescript uses concepts like Types and Interface to identify data.

No such concept is available with JavaScript.


The Ecosystem is quite powerful. It allows you to statically type various  JavaScript features like Union Types, Intersection, and Discriminated Union.

JavaScript create code without a Build Step.

npm package

npm packages either come with Static Type definitions or the language has an external one to install.

JavaScript create code without a Build Step.

Learning curve

Stiff learning curve. Requires prior scripting knowledge.

Flexible and easy to learn, being a scripting language.


Typescript has a feature of prototyping.

JavaScript does not have this feature.


Typescript does not have a large community of developers.

The JavaScript has a big community of developers.


Typescript code needs to be compiled

No need to compile JavaScript code.


To get the maximum out of Typescript, developers should constantly annotate their code.

No Annotations required for JavaScript.

Typescript or JavaScript?

Eventually, if you, as a developer, prefer to work on a relatively small project, you can certainly opt for JavaScript. Alternatively, a group, possessing decent expertise and contemplating on a large scale assignment, Typescript will ideally suit you, which is an advanced form of JavaScript programming.