Interview questions for typescript developer


JavaScript is #1 language used for web development today.  It is the era of new client-side technologies like Grunt, AngularJs, Gulp, Yeoman and others, that ensures a better, advanced, and improved user experience. But JavaScript is not always a good choice for colossal web applications. That’s why TypeScript was developed. Below are some TypeScript Interview Questions that will provide you with in-depth knowledge and help you prepare for your interviews if you are among those who would like to start your web development career and also looking forward to being employed by firms and companies that hire typescript developers.

TypeScript VS JavaScript: what is the difference?

TypeScript is an OOP or Object-Oriented language that is known for its static typing feature. It supports models and at the same time is supporting optional parameter functions. JavaScript is a scripting language that doesn’t support modules, does not offer static typing, neither does it support optional parameter function.

TypeScript: what do you know about it?

TypeScript is a programming language that builds on JavaScript. The primary difference of Typescript is that it is typed and then compiled to JavaScript. The primary difference is that it is a totally object-oriented programming language that has classes and interfaces, the key feature of TypeScript is that it is statically typed. TypeScript is created using the JavaScript ES6 version, yet, it offers additional features and benefits making it different from JS. It is possible to write TypeScript code using any IDE or code editor you are used to. You can compile code written in Typescript into JavaScript with any code compiler. It means you need to have a compiler installed to create software with TypeScript.

What are the benefits of TypeScript that make it a best choice for programming?

There are many reasons to use Typescript and here are the primary ones:

  • It uses the extra ECMAScript features: 

TypeScript can support the new ECMAScript standards; not only that, but it also changes them to targets of ECMAScript. As a result, you can employ all ES2015 features easily.

  • It possesses a static typing:

TypeScript can add type support to JavaScript, a treasured value. It is typed dynamically. As a result it doesn’t know the variable type that is instantiated at a runtime so that you spend less time on coding and can easily find and correct errors. 

  • It has a type of inference: 

TypeScript offers more manageable typing. So if you do not type in types,  it prevents you from coding what would cause a runtime error.

  • It supports IDE: 

The primary goal of TypeScript is to improve the programmer experience. 

So, unlike JavaScript, there are a lot of IDEs supporting Typescript. These are Visual StudiCodeVS code, Sublime, IntelliJ/WebStorm, Atom etc.

  • Easy integration 

TypeScript is related to JavaScript, so it can be integrated with various JavaScript libraries. Of course you need to do some work, to make your Typescript software work with any JS library you might need. 

  • It has a firm null checking: 

The primary issue of JavaScript programming are errors. Most mistakes can be prevented since the developer can’t use a variable unknown to the compiler.

What are TypeScript’s primary features?

It works on many platforms (cross-platform):  

You can install a TypeScript compiler and use it on any OS (operating system), e.g., Windows, macOS, Linux.

It is OOP:

TypeScript is an object oriented programming language, so it has interfaces, Classes, and Modules. 

Simple error detection with static typing checking

Typescript supports static typing allowing to check the code without actual compilation. So you can detect errors when writing code, that reduces a lot of time spent on tasks. The static typing is an optional feature, so the developer can use dynamic typing as it is in JavaScript. 

Aides DOM Manipulation:

TypeScript helps DOM manipulation so you can easily add and remove elements. 

Provides Features of ES 6:

It is based on ECMAScript 6, the version of JavaScript that was released in 2021. So you are getting access to all functions like modules, objects, etc.  

What are the TypeScript benefits?

  • TypeScript is speedy and you can learn it easily
  • It can run on JavaScript engine and any browser supporting JS.
  • It is very much similar to JS, plus it has similar semantics and  syntax.
  • It gives backend developers tools to write code for the front-end.
  • It works very well with JavaScript frameworks, foundations and libraries causing no problem.
  • Features from the later version of JavaScript engines are also included.

What are TypeScript disadvantages ?

  • It is time consuming when you need to bring code together.
  • TypeScript doesn’t provide the support of abstract classes.
  • If the TypeScript application runs on the browser, a compilation step will be required to change your TypeScript code into JavaScript.
  • You need to have a definition file to use third party libraries .

Conclusion

TypeScript is similar to JavaScript, yet, with some differences. It allows you to write the code the way you want to. The answers provided to the question above will surely help you learn more about it, no matter what your intent is.

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