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What are the Advantages of TypeScript over JavaScript?

ยท 5 min read
Deniz Colak

TypeScript is an open-source language that is a statically-typed superset of JavaScript. It was developed and maintained by Microsoft, and it has been gaining popularity among developers due to its numerous benefits. In this blog post, we'll explore the advantages of using TypeScript over Javascript.

I can tell you from my experience that TypeScript offers a level of sophistication and control that simply does not exist in JavaScript. In our teams, we are using it improve development experience and code quality. And it makes it easier to build large-scale application with multiple teams. Thanks to TypeScript. ๐ŸŽ‰


TypeScript adds optional type annotations, interfaces, and other features to JavaScript, making it easier to develop and maintain large and complex projects.

The Advantages of TypeScript over JavaScriptโ€‹

As we mention previously, TypeScript is especially beneficial for large-scale projects where code maintenance and scalability are important. It provides a number of benefits, let's take a look at some of them.

Improved Tooling and Integrationโ€‹

One of the main advantages of TypeScript over JavaScript is its improved tooling and integration with other technologies. TypeScript has a rich set of tools, such as an integrated development environment (IDE) and text editor support, that makes it easier to develop and debug code. This can significantly reduce the time required to develop an application and help ensure the code is of a higher quality.

For example, if you use Visual Studio Code as your text editor, you'll have access to features like code completion, error checking, and debugging. You can also use the TypeScript Compiler to check your code for errors and warnings before you run it.

Example Person Interface with TypeScript
interface Person {  name: string;  age: number;}const person: Person = {  name: "John Doe",  age: 32,};console.log(; // Output: "John Doe"console.log(person.age); // Output: 32

In the above example, we have defined an interface for a "Person" object that contains two properties, name and age. By using the interface keyword, TypeScript provides us with improved tooling support and helps us catch errors at compile time.


For instance, if we accidentally misspelled the name of the property age as gage, the TypeScript compiler would flag an error, allowing us to correct the mistake before running the code.

Strong Typing and Type Inferenceโ€‹

One of the other benefits of TypeScript is strong typing. TypeScript requires you to declare the type of variables, which can help prevent type-related errors. This makes code easier to read, maintain, and debug, and can also help reduce the risk of security vulnerabilities. For example, consider the following JavaScript code:

Example JavaScript Code for String Concatenation ๐Ÿ˜…
const result = "5" + 5;console.log(result); // Output: "55"

In the above code, JavaScript performs a string concatenation instead of an addition operation because the operands are of different types. This can lead to unexpected results and can be difficult to debug.

In TypeScript, we can use type annotations to specify the type of a variable.

Annotated the result variable with the number type
const result: number = 5 + 5;console.log(result); // Output: 10

In the above example, we have annotated the result variable with the number type. If we try to perform the addition operation with operands of different types, the TypeScript compiler will flag an error, making it easier to catch and fix the mistake.

Improved Code Readability with TypeScriptโ€‹

TypeScript's strong typing and type inference also make code more readable, especially for large projects. For example, consider the following JavaScript code:

Example Javascript Code for Adding Two Numbers
function add(a, b) {  return a + b;}console.log(add(1, 2));

The same code in TypeScript would look like this:

Example TypeScript Code for Adding Two Numbers
function add(a: number, b: number): number {  return a + b;}console.log(add(1, 2));

The type annotations in the TypeScript code make it much easier to understand what the add function is expecting and what it will return.

Interfaces and Classes in TypeScriptโ€‹

TypeScript also includes features like interfaces and classes, which are not available in JavaScript. Interfaces allow you to define a contract that classes must implement. For example:

interface IEmployee {  name: string;  age: number;  getDetails(): string;}class Employee implements IEmployee {  name: string;  age: number;  constructor(name: string, age: number) { = name;    this.age = age;  }  getDetails(): string {    return `Name: ${}, Age: ${this.age}`;  }}const employee = new Employee("John Doe", 30);console.log(employee.getDetails());

In this example, the IEmployee interface defines the structure of an Employee class, and the Employee class implements the IEmployee interface.

BONUS: Recommended TypeScript Resources

If you're interested in learning more about TypeScript, here are some resources:


In conclusion, TypeScript offers a range of benefits over JavaScript, including improved type safety, tooling, and integration. By using TypeScript, developers code can be high-quality, scalable, and maintainable that is easier to debug and test. Whether you're building a small or large-scale application, TypeScript can help improve your development experience and increase your productivity.