Reasons for Using TypeScript Instead of JavaScript

Gilly | April 22, 2023

Photo by Jexo on Unsplash.


TypeScript has gained significant popularity among developers as a superset of JavaScript, offering additional features and advantages over its predecessor. In this article, we will explore the key reasons why developers choose TypeScript over JavaScript and provide examples to highlight these benefits.

1. Static Typing

One of the primary reasons for adopting TypeScript is its support for static typing. Unlike JavaScript, TypeScript allows developers to define and enforce variable types, making it easier to catch errors and improve code quality. Consider the following example:


function add(a, b) {
    return a + b;

console.log(add(5, "10")); // Output: "510"


function add(a: number, b: number): number {
    return a + b;

console.log(add(5, "10")); // Error: Argument of type '"10"' is not assignable to parameter of type 'number'

The TypeScript compiler detects the type mismatch during compilation, preventing potential bugs that might arise from incompatible types.

2. Enhanced IDE Support and Tooling:

TypeScript provides superior IDE support and advanced tooling options, thanks to its static typing. IDEs can leverage TypeScript's type information to offer autocompletion, intelligent code suggestions, and real-time error checking. Such features enhance developer productivity and help identify issues early in the development process.

3. Improved Maintainability and Scalability:

As projects grow in complexity and size, maintaining and scaling JavaScript codebases can become challenging. TypeScript's static typing allows for better code organization, modularization, and refactoring. By catching errors at compile-time and providing clear interfaces, TypeScript reduces the likelihood of bugs and eases the process of maintaining and extending projects over time.

4. Stronger Object-Oriented Programming (OOP) Support:

TypeScript offers robust support for object-oriented programming concepts such as classes, interfaces, inheritance, and encapsulation. These features promote code reusability, modularity, and the implementation of well-defined design patterns. Here's an example:


interface Shape {
    calculateArea(): number;

class Circle implements Shape {
    constructor(private radius: number) {}

    calculateArea(): number {
        return Math.PI * Math.pow(this.radius, 2);

const circle = new Circle(5);
console.log(circle.calculateArea()); // Output: 78.53981633974483

By leveraging TypeScript's OOP capabilities, developers can write cleaner, more structured code.

5. Compatibility with JavaScript Ecosystem:

TypeScript is a superset of JavaScript, meaning that any valid JavaScript code is also valid TypeScript code. This compatibility allows developers to gradually introduce TypeScript into existing JavaScript projects without having to rewrite everything from scratch. Additionally, TypeScript can consume JavaScript libraries and frameworks seamlessly, enabling developers to leverage the vast JavaScript ecosystem.


TypeScript's static typing, improved tooling, maintainability benefits, strong OOP support, and compatibility with JavaScript have made it a preferred choice for many developers. By adopting TypeScript, developers can write safer, more maintainable code and enjoy the advantages of a statically typed language while still benefiting from the extensive JavaScript ecosystem.