Know about the core differences between Typescript vs Javascript, pros & cons, and decide when you should use which one for your project.

1. TypeScript Vs
JavaScript:
Come Face To
Face In
Battleground
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2. Quick Overview:
You must already be familiar with
JavaScript if you have worked on any Web
development project as JavaScript has been
here for quite a long time now. Besides
being a popular scripting language,
JavaScript has served in developing
enormous web projects. However, ever
since TypeScript has come to play, the
dynamics have changed. Initially, JavaScript
code was unable to handle complexities.
Hence, TypeScript was introduced. It is an
open-source programming language that is
usually adopted for large applications.
Although both serve the same purpose, they
are quite different from each other.

3. Instigation

4. To be quite clear, each of your JavaScript
codes is valid in TypeScript; which denotes
that TypeScript is a bigger picture or bigger
scope of JavaScript. In simple terms,
JavaScript + extra features = Typescript
Hence, if you save your (.js) JavaScript file
with (.ts) TypeScript extension, it will work
just as fine. However, do not misunderstand
that JavaScript and TypeScript are the
same. This guide states the basic differences
between both of them. Without much
introduction, let’s get a brief overview of
these languages!

5. What is
JavaScript?

6. JavaScript is the most in-demand and
preferred programming language- whether
for the Web or to go with HTML. Javascript
is Cross-platform and lightweight; it is an
object-based scripting language used to
build client-side dynamic pages.
Each program in the JavaScript language is
known as a script. These scripts are noted in
HTML pages and implemented
automatically when the page loads.
JavaScript is carried out as plain text.
Hence, it does not require any special or
unique compilation and preparations to
run. There are several Javascript
frameworks in the market that you must
know about.

7. History Of JavaScript
Launched back in September 1995,
JavaScript took ten days to develop.
Initially, it was known as Mocha.
Later, in November 1996, Netscape
presented JavaScript to the European
Computer Manufacturers
Association(ECMA) International.
Created by Brendan Eich(programmer of
Netscape Communications Corporation),
JavaScript was built to work on Netscape
navigator. However, with a huge gain in
popularity, this popular scripting tool
turned to LiveScript. Later, It was again
renamed as JavaScript to consider the Java
support of Netscape within its browser.
Below is a significant landmark in the
History of JavaScript. Let’s have a look!

8. In 1998, ECMAScript 2 was released
In 1999, ECMAScript 3 was released
Later in 2005, Mozilla and Eich joined
ECMA to build E4X JavaScript.
January 2009 was the day when the
CommonHS project was launched to
define a usual and common standard
library.
In 2011 June, ECMAScript 5.1 was
released
In 2015 June, ECMAScript 2016 was
released
In 2017 June, ECMAScript 2017 was
released. This is the current version as
of now.

9. Features Of JavaScript
JavaScript is a Cross-platform language
It has a high learning curve
It is easy and friendly to get started with
JavaScript is used for server-side and
client-side

10. It is extremely robust, flexible, and
powerful
JavaScript is a dynamic language
It has added dependencies
It offers a robust testing workflow
You have all the freedom and right to
operate it however you wish to.
You might want to know the most trending
Javascript frameworks.

11. What is
TypeScript?

12. Strongly referred to as a safe cocoon of
JavaScript, TypeScript is an open-source
programming language. It is purely object-
oriented. Ideally, TypeScript is maintained
and developed by Microsoft with regards to
the Apache 2 license. It requires a compiler
to compile and build a JavaScript file.
Hence, it cannot run on the browser
directly. To be more precise, you can call
TypeScript the ES6 version of JavaScript
which has some additional features.
History Of TypeScript
Back in 2012, Anders Hejlsberg developed
TypeScript and made it public for the first time
Microsoft worked on developing TypeScript for
2 years internally. Later, in 2013, It released
TypeScript 0.9.
Below is a significant landmark in the History of
TypeScript. Let’s have a look!

13. At Build 2014, extra support for generics
TypeScript 1.0 were released.
In the same year in July 2014, a brand
new TypeScript compiler was
introduced, which was, however, 5x
times faster than the previous version.
Later in 2015 July, support was
introduced for ES6 modules, decorators,
Namespace keyword, etc.
In 2016 November, additional features
such as lookup types, mapped types,
key, and rest were introduced.
Finally, on 27th March 2018, updated
keys with intersection type and
conditional type support were added in
TypeScript.

14. Features Of TypeScript
Bug prevention and Code Refactoring
Code navigation and Code
discoverability
Excellent Maintenance
TypeScript provides robust
productivity for developers
TypeScript supports sub-interfaces,
interfaces, sub-classes, and classes
Static Typing feature
Scalable HTML5 for client-side
development
TypeScript supports ES6

15. Why
TypeScript If
We Already
Have
JavaScript?

16. Initially, when JavaScript was introduced,
the development team announced
JavaScript as a client-side programming
language. However, when developers
started implementing and using the
language, they discovered that JavaScript
could also be utilized as a server-side
programming language.
That said, JavaScript gained huge popularity
in no time. Meanwhile, during its growth,
JavaScript’s code became considerably
heavy and complex. As a result, JavaScript
can no more be considered an Object-
oriented programming language. This is a
major factor restraining JavaScript from
reaching the heights at enterprise levels as a
server-side technology. To overcome this
gap, TypeScript was built and introduced by
the development team.

17. Benefits Of
TypeScript
Over
JavaScript

18. TypeScript supports static typing,
unlike JavaScript. This denotes that
static typing enables checking on the
type appropriateness at the compile-
time.
TypeScript possesses a feature of
strongly-typed, which lacks in
JavaScript.
TypeScript has a namespace concept by
elaborating a module.
TypeScript can easily run on any
JavaScript engine or browser.
TypeScript identifies compilation errors
right at the developmental stage. Due to
this feature, the chances to mark errors
at the runtime becomes considerably
less and minor. On the other hand,
JavaScript marks errors at the runtime.

19. TypeScript has excellent tooling
support due to its IntelliSense. It offers
active hints to the language as the code
gets added.
Quick Read: How to Build To-do App with
Vue 3 Typescript

20. Drawbacks Of
TypeScript
Over
JavaScript

21. TypeScript fails to support abstract
classes.
TypeScript is time-consuming when it
comes to code compilation.
Bonus: When it comes to job opportunities
and learning curve, TypeScript wins over
JavaScript here as well. On an average basis,
TypeScript developers earn a salary of
$148,000 annually, whereas JavaScript
developers earn a salary of $110,000 per
annum. In cases you learn TypeScript, you
can easily work on both TypeScript as well
as JavaScript projects!

22. The
Distinction

23. JavaScript Vs TypeScript:
When to Use Which?

24. Should
TypeScript
Replace
JavaScript?

25. You must be thinking about ditching
JavaScript and adopting TypeScript? Well, the
answer to replacing TypeScript over
JavaScript is a NO. TypeScript is not suitable
for several types of projects. Hence, it cannot
be an alternate for JavaScript. JavaScript
remains the favorite and preferred client-side
scripting language as it is easier to run, debug,
and refresh tiny code chunks. JavaScript is an
excellent choice when you search for
flexibility because it enables you to build
functionality without following certain rules.

26. However, when dealing with big codebases
and a preference for speed, know that
TypeScript is the best choice. The reason for
this is simple. The growth brings tons of
complexities in handling the codes. This
leads to potential errors, which are always
better to catch during compile time.

27. Conclusion

28. To wrap up, I shall again highlight that
JavaScript is ideal for small web projects. In
case you have a team that handles
complicated projects, opting for TypeScript
is an ideal choice.
TypeScript was ideally designed for large
apps that follow Object Oriented
Programming language. Additionally,
TypeScript supports several features like
interfaces, classes, inheritance, and
namespaces. All in all, TypeScript has easy
maintenance, improves project
productivity, and is excellent for code
organization. The introduction of
TypeScript has bridged the gaps that
JavaScript has.

29. Thank You
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