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TypeScript vs JavaScript: Difference between TS and JS

JavaScript is a scripting language that helps you build interactive web pages. The idea behind developing the JavaScript was to make it a complementary scripting language like Visual Basic was to C++ in Microsoft’s language subdivisions.

First, JavaScript was not designed for large complex web applications. That is why it was not an object-oriented language like Java, C++, or PHP. Before ES2015, Javascript relied on prototype-based architecture and did not support classes.

Javascript is used in the HTML pages, which will be executed automatically as the page loads.

History of Javascript

Netscape Communications company programmer Brendan Eich developed JavaScript but initially called Mocha at that time when it was launched in September 1995.

After earning a reputation as the best scripting language, it was renamed to JavaScript, which reflects Netscape’s support of Java within its browser.

In November 1996, Netscape presented JavaScript to ECMA (European Computer Manufacturers Association). From then, they are maintaining and responsible for next-generation Javascript.

In 2015, ES5 was released, which turns out to be the groundbreaking changes in the Javascript community. Right now, we are using ES2019-2020, depending on the time.

What is TypeScript

TypeScript is an open-source language developed and maintained by Microsoft Corporation.

Typescript is the modern age Javascript programming language. TypeScript is a statically compiled language to write a clear and simple Javascript code.

TypeScript is a strict syntactical superset of JavaScript languages and adds an optional static typing to the language.

TypeScript is designed for a development of large scale web development applications and tranpiles to JavaScript. TypeScript supports Object-oriented programming by default.

The TypeScript source file is saved in “.ts” extension, which lets you run on any devices.

TypeScript is a superset of JavaScript, or let’s put it like TypeScript is a sort of JavaScript with some added features.

History of Typescript

Typescript was first made public in the year 2012.

After two years of internal development at Microsoft Corporation, the TypeScript 0.9, released in 2013.

An additional support for generics TypeScript 1.0 was released at Build 2014.

In July 2014, the new TypeScript compiler was released, which is five times faster then it’s the previous version.

In July 2015, TypeScript had provided the support for ES6 modules, namespace keyword, for, of support, decorators.

In November 2016, they added an new feature like key and lookup types, mapped types, and the rest.

On March 27, 2018, they improved conditional types and the improved key with intersection types supports added in the Typescript.

Features of TypeScript

  1. Typescript provides an optional static typing, classes, and Interface.
  2. TypeScript code is converted into a Plain JavaScript code because TypeScript code is not understandable by the browsers.
  3. TypeScript supports ES6.
  4. TypeScript can run efficiently run on environments where JavaScript can run without any problem.
  5. Transpiler offers the error-checking feature in TypeScript. You are allowed to focus on the errors on the coding before running the actual script on the compiler. This possible because it compiles the code during coding and produces compilation errors.
  6. With TypeScript, you can expect static type-checking. It is done at compile time. Anyone can locate errors while typing the code, so you need not wait until the actual execution of the code.

Let’s see the difference between TypeScript vs JavaScript in detail.

TypeScript vs Javascript: The Difference

  1. Typescript is a robust type of object-oriented compile language, and Javascript is a high-level interpreted programming language.
  2. TypeScript has a Static typing, but JavaScript does not support static typing features.
  3. TypeScript has support for Interface, but JavaScript does not support Interface.
  4. TypeScript supports optional parameter function, but JavaScript does not support an optional parameter function.
  5. Typescript can be saved as ts or .tsx extensions, whereas Javascript can be saved as .js.
  6. With TypeScript, many npm modules either come with static type definitions or have the external one that is easy to install. Javascript does not come with this feature.
  7. TypeScript requires a basic knowledge of JavaScript, whereas Javascript is flexible and easy to learn scripting language.
  8. TypeScript does not have a vast developers community, whereas Javascript has an enormous number of developer communities that can almost help you with every problem.
  9. TypeScript: Syntax refers to a set of rules and processes for coding or writing programs. Every programming language defines its bit of syntax. A TypeScript program comprises Functions, Modules, Statements & Expressions, Variables, and Comments. JavaScript: All statements are written inside of the Script tag. The requests the browser program to interpret and execute all the text that comes between these tags like a script. The <script>// javascript code</script>.
  10. To get the most out of TypeScript, developers should continuously annotate their code. No Annotations Required is the need for Javascript.
  11. The average salary for “Typescript developer” salary ranges from around $148,027 per year in the United States. On the other hand, The average salary for a Javascript Developer is around $110,777 per year in the United States.
  12. JavaScript is the scripting language that helps you create interactive web pages, whereas Typescript is a superset of JavaScript.
  13. The TypeScript code requires to be compiled while JavaScript code doesn’t need to compile.
  14. TypeScript is the robust type system, including generics and JavaScript features for large size projects, whereas JavaScript is the ideal option for small size projects.
  15. For addition and removal of DOM element nodes, TypeScript could be useful and fast, whereas using JS, it can be painful.


All said and done, Typescript, as well as JavaScript, is built with its limitations and features. JavaScript is the lightweight and dynamic coding language, particularly for improving HTML web pages.

However, it is not a complete coding language. As an interpreted programming language, JS comes inside a web browser’s context.

Typescript is compiled to JS, which can be employed for any JS code; therefore, TypeScript comes with more benefits, which makes it more commonplace and popular.

We also see more improvements with each release and amazing TypeScript features added with subsequent releases.

That is it for the TypeScript vs JavaScript difference.

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