In the world of web development, the choice between TypeScript and JavaScript can be a tough one. Both languages have their benefits and drawbacks, and it’s important to understand the difference between JavaScript and TypeScript before making a decision. Whether you’re a seasoned developer or just starting out, choosing the right language after the typescript vs javascript popularity can have a significant impact on your project’s success.


In this blog post, we’ll explore the key differences between JavaScript and TypeScript and help you determine which one is the best fit for your needs.


A well-known scripting language called Javascript has been providing the TypeScript or JavaScript developer community with a lot of competition for a very long time. But you should be aware that anytime one language becomes more popular, another one enters the market and fiercely competes with it. This time, it’s none other than Typescript, a better-than-Javascript superset.


TypeScript is a programming language developed and maintained by Microsoft with the intent to handle large-scale applications. It is a typed superset of JavaScript that compiles to plain JavaScript, meaning that you can use any valid JavaScript code in a TypeScript file. TypeScript adds additional features to JavaScript, such as classes, interfaces, and type annotations, which can help you write more reliable and scalable code.


Read Also: Best Javascript Frameworks For Web and App Development


Here is a simple example of a TypeScript file:


typescript code
In addition, Angular uses TypeScript as well for web development services. According to the report, TypeScript and JavaScript are the second and third most sought-after programming languages by developers, respectively. 


This article will take you through the similarities and differences between the two programming languages namely – Typescript and Javascript. Stay with us to know the benefits of each.



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Typescript Vs Javascript – Understanding The Real Difference

Being a superset of JavaScript, TypeScript allows for the use of any valid JavaScript code in TypeScript code. However, TypeScript has additional features that are not available in JavaScript, such as interfaces and classes. These features must be compiled down to JavaScript in order to run in a browser or on a server.


what is type script


The main difference between the extensions of JavaScript and TypeScript files is that TypeScript files use the .ts extension, while JavaScript files use the .js extension. But there still exist many more differences to make both languages different from each other.


Before moving forward, let’s check the Google trend for the past year’s search results for both the Frontend languages.


typescript trend


Source: Google Trends


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In Spite Of Javascript’s Existence, Why Was Typescript Developed?

As a language for client-side programming, JavaScript was introduced. But as JavaScript’s use in web development grew, programmers realized that it could also be thought of as a server-side programming language.


But the JavaScript code also becomes quite complex and cumbersome. As a result, JavaScript was unable to meet the requirements of an object-oriented programming language. Consequently, JavaScript will never be a widely utilized server-side technology. The TypeScript programming language was created to fill this gap.


What is Typescript?

TypeScript, an open-source, object-oriented programming language, was developed by Microsoft as a typed superset of JavaScript, which means that it adds additional features to the JavaScript language. TypeScript was created to address some of the challenges and limitations of JavaScript, particularly in large-scale projects, and can be used for both client and server-side applications. Libraries of Javascript are also compatible with Typescript.


What is Typescript


TypeScript is a programming language that offers both dynamic and static typing, as well as a range of features such as classes, visibility scopes, namespaces, inheritance, unions, interfaces, comments, variables, statements, expressions, modules, and functions. It can be run on Node.js or any other browser that supports ECMAScript 3 or later versions.


Since TypeScript is an extension of JavaScript, all JavaScript code is valid TypeScript code. However, this doesn’t mean that the TypeScript compiler can process all JavaScript. For instance, the following code would produce an error:


typescript error
TypeScript also provides files that can include type data from current object files, similar to how C++ header files define the creation of current object files. This allows other apps to use the values defined in these files as TypeScript entities with statically typed values. There are also third-party header files available for popular libraries such as jQuery, D3.js, and MongoDB, as well as TypeScript headers for Node.js core modules, which enable Node.js development using TypeScript.


The TypeScript compiler is written in TypeScript and compiled into JavaScript under Apache License 2.0.


So why was static typing added to JavaScript in the creation of TypeScript?


Benefits of Static Methods in JavaScript:

JavaScript is an immensely versatile programming language that offers developers a range of tools for building powerful and interactive web apps, one being static methods. Here we explore their benefits in terms of making our code cleaner, more efficient, and easier to maintain. What Are Static Methods in JavaScript?


Before we delve into the advantages of static methods, let’s first define them. In object-oriented programming, methods are actions performed by objects; static methods on the other hand are calls made against an instance of that class rather than just calling out directly on it – in JavaScript they’re defined using the static keyword.


1. Improved code organization:


One of the primary advantages of static methods is improved code organization. Once declared static, a method becomes part of its respective class rather than having to be defined separately for every instance of it – thus making use easier than ever!


By using static methods, your code can be organized more efficiently without repeating similar lines of text in multiple places – making your code more readable and simpler to maintain.


2. Reduced memory usage:


Static methods provide another advantage by minimizing memory usage. A static method only loads into memory once, regardless of how many instances are created of its class; this can help save space when creating multiple instances at the same time, by decreasing overall usage of memory resources in code.


3. Improved performance:


Static methods can also enhance the performance of your JavaScript code by being loaded only once into memory and being called more quickly than non-static methods – an advantage when calling methods frequently or under timed conditions.


4. Better code reusability:


Static methods can significantly increase code reusability. Once declared static, an individual method becomes accessible across other classes that inherit from that class; creating a library of static methods that you can reuse across projects makes your code modular and easier to manage.


5. Simplified testing:


Static methods also make testing your code simpler by being unconnected to any specific instance of a class and thus can more easily be tested independently of each other, helping ensure its correct functioning while decreasing bugs or errors that might otherwise exist.


Why is Typescript Required?

TypeScript is an enhanced version of JavaScript, so it requires some learning to write TypeScript code, unlike languages like CoffeeScript (which adds syntactic sugar) or PureScript (which is not related to JavaScript at all). 


However, it is worth noting that types are optional in TypeScript and any JavaScript file is valid in TypeScript. While the compiler will alert you to any type of issues in your initial files, it will still produce a working JavaScript file. As you gain experience with TypeScript, it becomes easier to improve your skills over time.



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Is Typescript Better For Frontend Or Backend?

TypeScript can be used for both frontend and backend development, as it is compiled into JavaScript. In addition to its use on the frontend for web page and app development, like JavaScript, it is also well-suited for use on the backend for large-scale, complex enterprise projects.


However, it is worth noting that other top frontend frameworks, such as React, Angular, and Vue, can also be used to build modern applications.


Read Also: Understanding the Demand for Website Redesign: When and Why?


Advanced Types Used in TypeScript

TypeScript has several built-in types that can be used to annotate variables and function parameters. These types help the TypeScript compiler to catch type errors and ensure that the code is correct.


Here is a list of the types in TypeScript:


  • boolean – Represents a boolean value (true or false).
  • number – Represents a numeric value (integer or floating point).
  • string – Represents a string value.
  • array – Represents an array of values. You can specify the type of elements in the array using the [] syntax. For example, number[] represents an array of numbers.
  • tuple – Represents a fixed-size array with elements of different types. You can specify the types of elements in the tuple using a comma-separated list. For example, [string, number] represents a tuple with a string and a number.
  • enum – Represents a set of related values. Enums are often used to define a set of constants.
  • any – Represents any value. This is used when you don’t know the type of a value, or when you want to allow multiple types.
  • void – Represents the absence of a value. This is often used as the return type of function that doesn’t return a value.
  • null – Represents the absence of a value.
  • undefined – Represents the absence of a value.
  • never – Represents a value that never occurs. This is often used as the return type of function that throws an exception or never returns.


In addition to these built-in types, you can also create your own types using interfaces, classes, and type aliases.


Features of Typescript

Some of the key features of TypeScript include:


1. Type system:

TypeScript has a type system, which allows you to specify the type of a variable or function parameter using type annotations. This can help you catch type errors before the code is even run, and can make it easier to understand and work with the code.


2. Interfaces:

TypeScript allows you to define interfaces, which specify the structure of an object. Interfaces can be used to enforce a particular structure for objects and can make it easier to understand how different parts of the codebase are related.


3. Classes:

TypeScript supports classes, which are templates for creating objects. Classes can have properties and methods and can be extended or inherited from other classes.


4. Modules:

TypeScript has a module system, which allows you to organize your code into smaller, reusable units. Modules can be imported and exported, which can make it easier to share code between different parts of your application.


5. Decorators:

TypeScript has a decorator feature, which allows you to define and apply custom logic to classes, methods, and properties. Decorators can be used to add functionality or modify the behavior of a class or method.


6. JSX:

TypeScript has support for JSX, a syntax extension for embedding XML-like elements in JavaScript code. This can be useful when working with frameworks like React that use JSX.


7. Compatibility:

TypeScript is a superset of JavaScript, which means that any valid JavaScript code is also valid TypeScript code. This makes it easy to migrate from JavaScript to TypeScript or to use TypeScript in a project that already uses JavaScript.


8. Better tooling:

TypeScript has a rich ecosystem of tools and libraries that can improve the development experience. For example, TypeScript can be integrated with IDEs and text editors to provide features such as code completion, type checking, and error highlighting.


Advantages Of Using Typescript Over Javascript

TypeScript provides various benefits that can help you write better web development code.
 In addition to its type system and other language features, TypeScript also supports-


  • namespaces
  • interfaces
  • null checking
  • generics
  • access modifiers


These features can make it easier to write and maintain complex projects and can improve the scalability and maintainability of your code.


Read Also: Node.js vs React.js: Which to Choose 


What is Javascript?

The programming language JavaScript is frequently used to develop interactive features for websites. It is a client-side language, which means that it is executed by the user’s web browser rather than on a server.


JavaScript is used to add dynamic behavior to websites, such as form validation, sliders, and dropdown menus. It is also used to create single-page applications, which are websites that load all of the necessary content and functionality in a single page rather than requiring the user to navigate to different pages.


JavaScript is a dynamically-typed language, which means that the type of a variable is determined at runtime rather than being explicitly declared. This allows for flexibility in coding, but can also make it harder to catch type errors and bugs.



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Key Differences Between Typescript And Javascript

When comparing TypeScript and JavaScript, there are several factors to consider:


1. Learning curve

To write TypeScript code, you should have a basic understanding of JavaScript and be familiar with object-oriented programming concepts. JavaScript is a popular and easy-to-learn scripting language, but it can be challenging to work with HTML and CSS to create web applications.


2. Developer community

TypeScript has gained popularity quickly and has been adopted by many enterprises. It has a large and supportive community, with many tutorials and guides available online. JavaScript has a smaller community, but it offers a wide range of libraries, frameworks, and code practices.


3. Typescript vs Javascript Performance

TypeScript was designed to address the challenges of JavaScript for large, complex applications, and it can save development time and improve efficiency. The only difference between TypeScript and JavaScript is that TypeScript code is compiled into JavaScript before it is executed.


4. Typescript vs Javascript Syntax differences

TypeScript has a syntax similar to JScript and .Net, with support for ECMAScript 2015 Standard features such as modules, arrow function syntax, and classes. It also includes variable declaration, functional paradigm, and a type system that JavaScript does not have. JavaScript follows the ECMAScript definition and offers event-driven style, functional and imperative programming, and structured programming elements such as if statements and loops.


5. Tools and frameworks

TypeScript is supported by Microsoft and has a number of leading frameworks and editors. It integrates closely with editors to provide error handling during compilation to prevent errors at runtime. JavaScript has a large ecosystem of frameworks available, including ReactJS, VueJS, Angular, and others.


6. Code

Here is an example of a simple TypeScript program that calculates the area of a rectangle:


typescript code to calculate rectangle area


This code defines two number-type variables with the names width and height. Additionally, it defines a function called calculateArea that accepts the two numbers w and has inputs and returns a numerical value.


The function calculates the area of a rectangle by multiplying the w and h arguments and returning the result.


Finally, the code calls the calculateArea function, passing in the width and height variables as arguments, and stores the result in a variable called area. It then prints the result to the console using template strings.


The equivalent JavaScript code would be:


typescript code to calculate rectangle area


As you can see, the TypeScript code is very similar to the JavaScript code, with the addition of type annotations for the variables and function parameters.


TypeScript’s type system can help catch type errors before the code is even run, and its additional features, such as interfaces and classes, can make it easier to understand and work with large codebases. However, because JavaScript lacks a type system and is dynamically typed, these functionalities are not available in JavaScript.


Why Migrate Your Project Javascript To Typescript?

Errors are more likely to arise if your codebase is large and complex. It would be beneficial if some problems could be fixed while compiling, though. TypeScript can now be utilized to reduce compilation errors. The best part is that the entire Java source may be used in its current state.


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Will JavaScript be replaced by TypeScript?

Regarding TypeScript, it is a totally separate language except that it shares some of JavaScript’s fundamental characteristics. As a result, JavaScript cannot and will never be replaced.


Conversely, TypeScript does not directly execute in web browsers. It trans compiles into JavaScript. Due to the fact that JavaScript runs directly in the web browser, it is simpler to debug and compile. However, not all project types are designed for TypeScript. Thus, each programming language has advantages and disadvantages as well as a unique collection of characteristics.



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We can conclude from the above article that both languages have their own pros and cons. Developers that wish to write understandable and organized code should use TypeScript whereas JavaScript can be used with HTML to enhance the quality of online sites. 


However, not all web browsers support TypeScript, much like JavaScript. Therefore, if you’re having problems choosing between TypeScript and JavaScript, get in touch with Syndell, a web development company, and get a free consultation. They’ll assist you to understand and choose the appropriate technology and language for your project requirements.