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TypeScript Vs JavaScript

TypeScript Vs JavaScript

TypeScript Vs JavaScript

Why TypeScript?

A language as well as a combination of tools, TypeScript is a compiled language. It is also object oriented, strongly typed and compiled language. It was introduced by Anders Hejlsberg of Microsoft. It is JavaScript’s superset. Its main components are language, compiler and editor-like features. The need of TypeScript arose because of limitations of JavScript.

For example, JavaScript is not able to offer object oriented features, compile-time code errors and strong type checking. A large code of JavaScript becomes very disordered and hard to sustain or even reuse. JavaScript can’t be used for complex applications without any provision for strong type system. A code written in TypeScript is first compiled and converted to a JavaScript file.

Code.ts represents code written in TypeScript and Code.js represents code written in JavaScript. Transpiler is used to convert TypeScript to JavaScript. TypeScript is also called compile-to-JS language.

Features of Typescript

Basic Features:

It implements elementary building blocks of a coding structure from JavaScript. If you want to know TypeScript, you should also have knowledge of JavaScript. To execute its code requires conversion into corresponding JavaScript code.

Js Libraries:

It is easily consumed from JavaScript code once compiled. Generation of JavaScript from TypeScript allows reusing of all existing frameworks and libraries of JavaScript.


It is easy to run on environments where JavaScript can run. It is compatible with many browsers, operating systems and devices. It is different in that it doesn’t require a specific virtual machine or runtime environment for execution.


Transpiler offers the error-checking feature in TypeScript. It will compile the code and produce compilation errors. Before the actual script runs, it will focus on the errors.

Type Cheacking:

With TypeScript you can expect static type-checking. It is done at compile time. You will be able to locate errors while typing the code without actual execution of the code.

DOM Management:

TypeScript could be useful where manipulation of DOM is concerned for addition and removal of elements.

Why JavaScript?

It is interpreted programming language used for creation of network-oriented applications. Its integration with Java derives its name. It is a lightweight programming language. It was also called LiveScript in the beginning. One of its main features is that it doesn’t need exclusive development tools. And you don’t need a compiler as it is interpreted language. It is still not a complete language when it comes to programming.

If you are performing client-side scripting, you don’t have the feature of read/write due to security issues. It can also not be used for applications like networking. It has no provision for multiprocessing and multithreading.

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Features of JavaScript

Server Communication:

It gives the option for validation of user input before the page actually gets sent off to the server.


For giving user pleasant experience, interfaces can be created where a mouse hover by the user over interface will produce a reaction.


Users will immediately see if they forgot to enter some data. They will not need to wait for page reloading.

Date and Time:

It has the provision of greeting user depending on what time of day it is along with date.

Miscellaneous Features:

It gives the user more power of use over the browser. For example, user can modify the colour of background of pages and text on browser status bar. It is also case sensitive. It abides by simple programming rules viz. terminating every statement with semicolon.

Difference Between TypeScript and JavaScript

Feature TypeScript JavaScript
Identification It is more identified as language with features of ObjectOrientedProgramming. Even though it also provides many other features. It is identified as scripting language.
Static Typing It supports static typing. It doesn’t support it.
Interface It has interface. It doesn’t have one.
Modules There is provision for modules. There is no support for modules.
Optional Parameter It supports this function. It doesn’t support this function.
Compilation errors Visible at development time. Not visible at that time.
Strengths Type system, JS features and generics. Lightweight, first-class functions of Object-oriented language, interpreted.
Community Not a large developers’ community is available. Huge community.
Compilation Code requires compilation. Code doesn’t require compilation.
Annotation For best results it is better to use annotation. Annotation is not required.

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