Typescript vs JavaScript: Why Choose Typescript Over JavaScript?

by Jigar Mistry
Typescript vs JavaScript - Understanding the difference

Websites are extensively utilized by all companies nowadays, and JavaScript is the most popular programming language to enrich HTML oriented pages.  While Javascript is quite prevalent, TypeScript is also attaining some popularity.

TypeScript is fundamentally JavaScript with certain added traits.  Both the languages are exercised, but TypeScript, with its additional traits, is rapidly becoming a favorite of many developers and web development companies.  Before understanding Typescript vs JavaScript, let’s view what these languages are.

Describing Typescript

A TypeScript is an object-oriented, open-source programming language formed and maintained by Microsoft.  It is a severe syntactical superset of JavaScript and augments elective static typing to the language.  TypeScript (TS) is intended for building large applications and trans-compiles to JavaScript.

The prevailing JavaScript programs are also valid TypeScript programs.  TypeScript may be utilized to build JavaScript applications for both server-side and client-side execution.  There are manifold alternatives available for trans-compilation.  Either default TypeScript Checker can be employed or Babel compiler can be entreated to transform TypeScript to JavaScript.

TypeScript supports the files that can include type data of present JavaScript libraries, much like C++ header files can define the construction of current object files.  This allows other programs to exercise the values well-defined in files as if they were statically typed TypeScript entities.  There are third-party header files for prevalent libraries like D3.js, jQuery, and MongoDB.  TypeScript headers for Node.js elementary modules are also accessible, permitting the development of Node.js programs within TypeScript.

TypeScript compiler is written in TypeScript and assembled to JavaScript.  It is registered under Apache License 2.0.  TypeScript is composed as a first-class language in Microsoft Visual Studio 2013 Update 2.  An official extension sanctioned Visual Studio 2012 to upkeep TypeScript as well.  The lead architect of C# and inventor of Delphi and Turbo Pascal, Anders Hejlsberg, has functioned on the formation of TypeScript.

Why Use TypeScript?

Why Use TypeScript?

There are diverse reasons that state what is TypeScript used for. Some of them consist of:

  1. Static Typing

    JavaScript is strongly typed and does not recognize what kind of a variable is until it is essentially instantiated at runtime.  TypeScript adds type support to JavaScript.

  2. Employing New Features of ECMAScript

    TypeScript supports novel ECMAScript criteria and trans-pile them to ECMAScript objectives of your choice.  Hence, you can use characteristics of ES2015 and beyond, like lambda, modules, functions, the spread operator, de-structuring, and classes.

  3. Enhanced IDE support

    The development practice with TypeScript is a great enhancement over JavaScript.  There is an extensive range of IDEs that have outstanding support for TypeScript, like Atom, Sublime, Visual Studio and VS Code, and IntelliJ or WebStorm.

  4. Type Inference

    TypeScript creates typing easier and less unambiguous by the practice of type inference.  Even if you do not type the types, they are still here to exclude you from doing something which would otherwise result in a runtime error.

  5. Interoperability

    TypeScript is strictly associated with JavaScript.  Thus, it has good interoperability proficiencies, but some additional work is needed to function with JavaScript libraries in TypeScript.

  6. Strict Null Examination

    Errors, such as cannot read property ‘x’ of undefined, is general in JavaScript software programming.  You can evade most of these types of errors as one cannot utilize a variable that is unknown to the TypeScript compiler.

Describing JavaScript

JavaScript, often shortened as JS, is a software design language that follows the ECMAScript arrangement.  JavaScript is just-in-time compiled, high-level, and multi-pattern.  It contains dynamic typing, curly-bracket syntax, first-class functions, and prototype-based object-orientation.  Together with CSS and HTML, JavaScript is one of the essential technologies of the World Wide Web.

JavaScript empowers interactive website pages and is an indispensable aspect of web applications.  The majority of websites utilize it for client-side web page behavior, and all chief web browsers have a devoted JavaScript engine to perform it. 

As a multi-paradigm programming language, JavaScript supports imperative styles, event-driven, and functional styles.  In one of our previous blogs on best JS frameworks, Vue vs React, it can be seen that Vue employs HTML templates, but there is an option to transcribe in JSX.  Whereas, React merely uses JSX.

It has an application programming interface (API) for working out with dates, text, standard data structures, Document Object Model (DOM), and regular expressions.  Nevertheless, the language does not comprise any input/output (I/O), like graphics facilities, networking, or storage, as the host background, commonly a web browser offers API.  JavaScript engines were formerly exercised in web browsers only, but they are now inserted in certain servers, customarily via Node.js.

These are also implanted in multiple applications formed with frameworks such as Cordova and Electron.  Though there are correspondences between Java and JavaScript, including syntax, language name, and respective standard libraries, these two languages are different and vary significantly in design.  

Why Use JavaScript?

Why Use JavaScript?

Today, JavaScript is in demand as it is primarily used for most of the web browsers and web-based applications.  It is also utilized beyond the web in servers, software, and embedded hardware controls.  Below are certain elementary aspects that state what is JavaScript used for:

  1. Fun and Interactive Language

    You have a comprehensive user interface to employ right away.  JavaScript contains a graphical UI that is fun and easy to deploy.  You can write codes that will function in the browser so that you can develop interactive projects early in the learning procedure.

  2. Low Threshold to Get Started

    JavaScript is the programming language that browsers employ.  It is simpler to get started with and to comprehend.  You can get going straight away.  Dissimilar to other languages, you do not have to install a lot of programs before you can even start.

  3. Superior Debugging Tools for Learning

    A collaborative JavaScript interpreter is developed right into the web browser, permitting you to research and get prompt feedback, which aids you to learn more rapidly.

  4. Strong Support for Learning

    Each browser comprises source code viewing characteristics that allow you to learn from other people’s live coding.  Also, JavaScript has the leading and most dynamic repository of library code in the ecosphere.  Individuals in the JavaScript community are very supportive and active in sharing and making utilization of each other’s codes.

  5. Foundational Language for Learning Programming Styles

    JavaScript support for the event-driven software design style, where the movement of your code is organized by system events or user events.  This type of programming is completely indispensable for developing user interfaces and is also a very cooperative paradigm for scheming scalable server-side systems.

  6. Rich interfaces

    You can employ JavaScript to contain items such as sliders and drag-and-drop components to offer a rich interface to your website visitors.

Typescript vs JavaScript: Head to Head Comparison

While comparing Typescript and JavaScript, we observe that Typescript is an open-source language.  This states that Typescript is JavaScript in addition to other traits.  We can name it as a superset of JavaScript.  On the other hand, JavaScript is a lightweight, interpreted software design language.

It is a robust programming language and does not have any multiprocessing or multithreading capabilities.  It is utilized in web development for augmenting HTML web pages.  The below table on JavaScript vs Typescript helps us understand the vital differences between these two technologies.

AspectsTypescriptJavaScript
Type It is a superset of JavaScript built to overcome code difficulty for huge projects. It is a scripting language that aids in creating robust web page content.
Ecosystem The Ecosystem is intuitive and powerful. Hence, it permits you to statically type varied kinds of idiomatic JavaScript traits like intersection, union types and discriminated union. Javascript provides the option to discover and form code without a build phase.
Data Binding TypeScript utilizes concepts like interfaces and types to define the data being employed. No such notion is presented in JavaScript.
Learning Curve It has a stiff learning curve. Also, it needs scripting knowledge. It is easy to learn and a flexible scripting language.
Npm Package With Typescript, countless npm packages either have static type definitions or have an exterior one that is simpler to install. Javascript provides the alternative to search and form code without any build step.
Prototyping Typescript has a trait of prototyping. JavaScript does not have this trait.
Annotation To avail the most out of TypeScript characteristics, developers must constantly annotate the code. No annotations are needed for JavaScript.
Compilation TypeScript code requires to be compiled. No requirement to compile code in JavaScript.
Client-Side or Server-Side It is specially used on the client-side. It is used in both server-side and client-side.
File Extension .tsx and .ts .js
Company Using The Technology Clever, Asana, and Screen award Codecademy, Airbnb, and Instagram
Community It does not have a huge community of software developers. It has a large community of software developers.

When to Choose Javascript and TypeScript?

JavaScript

  • Stable testing workflow:  Possessing a team that is already applying test-driven development is better than swapping to TypeScript even with all its connected features and costs.
  • Small assignments:   Javascript can be considered as a perfect solution for small teams or projects.
  • Build tools needed:  To form the ultimate Javascript, TypeScript needs an extra step to be performed.  For that reason, it is popular to utilize JavaScript without the assistance of build tools.
  • Unsupported framework:  Certain frameworks do not support TS.  TypeScript does not support frameworks like EmberJS, so you may be unable to take benefit of its characteristics.
  • Additional dependencies:  You require the type definitions of libraries that you need to utilize in TypeScript.  An additional type of definition effects in an added epm package.  There is a risk associated with utilizing this added type definition that they might be an improper choice.  Hence, select a popular library for your development as there are probabilities that it will be properly maintained in future.

TypeScript

  • Huge projects or numerous developers:  If you possess a huge project that you are operating on or have several developers functioning together, then TypeScript is the best alternative.  The access modifiers and interface of TypeScript can be an additional advantage in communicating API.
  • Functioning with a new framework or library:  If you are starting with a novel project that utilizes React and are not accustomed to its API, then you require to know that they propose type definitions.  You can utilize IntelliSense to aid you to navigate through and ascertain novel interfaces.
  • Favour compile-time type checking:  Expending vanilla TypeScript, it is completely possible to execute runtime type confirmation.  This also augments additional runtime, which you can escape by employing compile-time validation.

Advantages of TypeScript over JavaScript

Advantages of TypeScript against JavaScript
  • TypeScript has a trait that is strongly-entered or supports static typing.  This means static typing permits to check type accuracy at compile time.  Whereas, this is not obtainable in JavaScript.
  • TypeScript highlights the compilation errors at the time of development.  Due to this, at runtime, the scope of examining errors is very less.  On the contrary, JavaScript is an interpreted language.
  • TypeScript is nothing but a JS and some added features, that is, ES6 features.  It may not be kept in your targeted web browser but the TS compiler can compile .ts files into ECMAScript.

Frequently Asked Questions

Why should you use TypeScript?

TypeScript streamlines JavaScript coding, making it simpler to read and debug. TypeScript is open-source and renders extremely productive development tools for JavaScript practices and IDEs, namely static checking. It makes the code easier to read and understand.

How is TypeScript different from JavaScript?

TypeScript is different from JavaScript as the former is recognized as an object-oriented language while the latter is a scripting language. TypeScript facilitates the support for modules but JavaScript does not support the modules. TypeScript has an interface whereas JavaScript does not have any interface.

What is the advantage of TypeScript over JavaScript?

The main advantage of Typescript over JavaScript is that it facilitates the capability to augment static types to JavaScript code. Also, TypeScript recognizes the compilation errors in the development phase itself. Owing to this, the possibility of scrutinizing errors is very less at the runtime.


Conclusion

Observing the difference between TypeScript and JavaScript, it can be said that both technologies have their advantages and disadvantages.   JavaScript may not be a comprehensive coding language, but it is utilized along with HTML to enhance the quality of web pages.  JavaScript does come inside the environment of a developer’s web browser.

From TypeScript vs JavaScript, it is ascertained that TypeScript assembles into JS code, which can be utilized wherever JS is appropriate.  Still, TypeScript provides additional features, so it is achieving admiration and is employed by a wider audience.  It is also getting new improvements and features constantly, consequently, making it safer for future employment as well.  If you are still baffled on what to implement, TypeScript or JavaScript, contact our proficient team of developers aiding you to develop a robust web application.

Author Bio

Jigar Mistry

Jigar Mistry

Jigar Mistry is the Founder of Monocubed and is the main curator and writer of the content found on this site. He has 14+ years of experience in the information technology industry. He always believes in quality, in terms of code and application.