JavaScript

JavaScript is the Scripting Language which plays crucial part for creation of interactive applications. JavaScript follows the client side programming rules and get executed in browsers. Due the features like flexibility, dynamic , cross-platform, all browser supporting, its widely used in app developments. Due to the following features JavaScript is in demand for development of applications :

Interactive Language : can develop interactive projects during learning phase.

Low requirements : its simple to use so for starter it become easy to adapt and implement in applications.

Small Projects : Suitable for small Scale application

For the faster and better application development new programming languages are being introduced to market and are replacing other programming languages. TypeScript is one such new programming language which is taking the market of JavaScript and replacing in different fields. The main reason for more use of TypeScript over JavaScript are:

• It contain all the features of JavaScript with extra features.
• Every JavaScript can be saved and run using TypeScript extension.
• The complexity that bring JavaScript while using in server side.
• JavaScript Compatible with TypeScript

TypeScript

TypeScript is the Object Oriented Programming language introduced by Microsoft. TypeScript sits at the top of JavaScript and can be used for client as well as server side apps. Since, TypeScript is OOP language it includes features like static typing, inheritance, classes, scopes visibility, namespace, interfaces and so on. TypeScript can be used for building large scale and complex applications. Due to static typing, there is less chance of occurrence of error than dynamic typing. Practice of static typing leads to more code efficiency and less compile time errors.

TypeScript can be executed directly on browser like JavaScript so code get compiled to JavaScript which makes it compatible for both front and backend side app development for any scale projects. All the JavaScript codes can be executed by TypeScript compiler with some exceptions.

TypeScript Types

Any & Unknown : Allows developers to define variable without any types. Mostly used to declare incoming data whose type will be unknown.

Void : Used to set function return type which returns nothing

Intersection and Union Types : Intersection type allows us to combine different basic types to one type whereas Union Type allows us to choose one from multiple basic types.

Type Script support explicit as well as implicit types. During compile time, if we miss out to define type then compiler auto enable type inference to identify the type of data.
If we are to compare these two languages, we can compare on different terms :

Typing : JavaScript is loosely typed whereas TypeScript is Strongly typed.

Ecosystem: TypeScript is powerful and uses static typing so its more suitable for large scale and complex projects whereas JavaScript is simple to use and learn it is suitable for small scale projects.

Compiler: TypeScript need compiler to run whereas JavaScript does not.

Data Binding : TypeScript uses interfaces and types for data binding whereas for JavaScript no such feature is present.

Learning time: TypeScript requires OOP concepts and scripting Knowledge so requite more time to learn. JavaScript is simple and easy to learn so might requires lesser time than TypeScript to learn.

Client / Server Side : TypeScript used for Client side and JavaScript for both client and server side.

Conclusion

At last we can say that both language carries its own props and cons. It’s up to us to decide when to use which one on the basis of project size, complexity, time bounds. JavaScript could not be written in more cleaner and neat way than TypeScript but it still can be used to enhance web site performances. Due to need of compiler for TypeScript some browser does not support it, in such scenario we might need to use JavaScript.