What is the difference between Typescript and Javascript?

If you’ve ever worked on a web development project, you certainly won’t be separated from programming languages JavaScript. JavaScript has long been the most popular scripting language for many web projects.

typing is an open source programming language that is best suited for large applications. It was developed by Microsoft in 2012, mainly because the JavaScript code has become too complex to handle in terms of large-scale applications. So what’s the difference between Typescript and JavaScript?

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The difference between Typescript and Javascript

Virtually all of your JavaScript is valid in Typescript. This means that Typescript is a JavaScript or JavaScript superset that has many features.

So, if you save a JavaScript (.js) file with a Typescript (.ts) extension, it will work fine. But that doesn’t mean that Typescript and JavaScript are the same.

Before we break down the differences between typed and javascript, let’s understand what each language looks like!


JavaScript is one of the most popular basic web technologies. From its inception, it has been a general part of web applications that make web pages interactive and dynamic. It is a high-level language with a JIT (Just-in-Time) compiler and dynamic typing. Until recently, JS was a client-side implementation, but some newer JS engines also have a server-side implementation. JS syntax is very similar to Java, as are standard libraries. In fact, if you know Java, JavaScript will be easier to learn.

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JavaScript was developed by Netscape in collaboration with Sun Microsystems. Some of the unique features of JavaScript are:

  • Flexible, dynamic and cross-platform
  • Used for client and server
  • Slightly interpreted
  • Supported by all browsers
  • Typed motto
  • Compile JIT


TypeScript is no different from JavaScript in its purpose, but it is used to develop large applications. TypeScript trans compiles (compiles source to source) in JavaScript. It follows the structure of an object-oriented programming language and supports features such as classes, interfaces, namespaces, and inheritance. Static typing is possible in TypeScript using type annotations (numbers, strings, and Booleans). For example,

class Mahasiswa {private name: string;}

As we saw above, TypeScript is very standardized. This makes debugging better (during compilation itself), which is a more efficient way to code for large projects. TypeScript programs usually consist of modules, functions, variables, comments, expressions, and instructions, just like any other complete programming language. Some of the important features of TypeScript are:

  • Easy to maintain and increases project productivity
  • Static typing and annotation is possible
  • Supports object-oriented features such as interfaces, inheritance, and classes
  • Easy to troubleshoot and early error detection
  • Supports ES6 (ECMAScript) that provides easier syntax for manipulating objects and inheritance features
  • Excellent complete IDE support

Is TypeScript better than JavaScript?

Before you can further compare TypeScript and JavaScript, you need to answer another important question! Because TypeScript is a JavaScript superset, should we always use Typescript? Being a superset, is TypeScript suitable for all types of projects? The answer is no.

TypeScript is not a way to replace or make obsolete JavaScript. JavaScript is still the most popular scripting language at the client level. For smaller projects, using TypeScript can be a hassle, as translating code into JavaScript takes time, which is an extra step.

JavaScript runs directly in the browser, so for small snippets of code, it’s easier to refresh and troubleshoot the code. In the case of TypeScript, we need a proper IDE ready to run the code.

When to use TypeScript?

When the code becomes large, complicated to handle, and more prone to errors, it is better if some errors are detected even during compilation. That’s where TypeScript helps. The advantage is that the entire code base written in Java can be reused in this way.

TypeScript vs JavaScript

Now that we understand the basic features and purpose, let’s explore some of the differences between TypeScript and JavaScript in detail using the table below.

JavaScript superset developed to address the complexity of code for large projects A scripting language that helps create dynamic web page content
Errors can be found and fixed during compilation Errors can only be encountered during running, because it is an interpreted language.
Powerful typing, supports static and dynamic typing Poor typing, no static typing option
Converted to JavaScript code for browsers to understand Can be used directly in the browser
Because this is a superset, all JavaScript libraries and other JavaScript code work without modification JS libraries work by default
There is support for ES3, ES4, ES5 and ES6 There is no support for compiling additional ES3, ES4, ES5 or ES6 features
Supports modules, generics and data definition interfaces No support for modules, generics or interfaces
Functions can have optional parameters This feature is not possible in JavaScript
Code example:
function multiply (a, b) {
return a * b;
was result = multiplication (a, b);
console.log (‘Answer is -‘ + result);
Code example:
function multiply (a, b) {
return a * b;
was result = multiplication (a, b);
document.write (‘Answer is -‘ + result);
Numbers, strings are considered interfaces. Numbers, strings are objects.
Powerful and intuitive language Neat and clean, best suited for simple web applications
Community support is still growing and not too high Huge community of support with lots of documentation and troubleshooting assistance
Prototyping is possible No prototyping support
It takes time to learn and code, scripting skills are required. Learned on the go, no previous scripting experience required.
A compilation configuration (npm package) is required for static definitions No construction setup required


So these are some of the differences between Typescript and JavaScript. Therefore, JavaScript is best when working on a small web project. If you have a team with good skills and knowledge and want them to handle complex projects, using TypeScript is the right choice. If you are learning TypeScript, you can definitely work on JS and TypeScript projects.

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