TypeScript Interview Questions and Answers

TypeScript Interview Questions and Answers

TypeScript is a language that aims at easing development of large scale applications written in JavaScript. TypeScript adds common concepts such as classes, modules, interfaces, generics and (optional) static typing to JavaScript. It is a superset of JavaScript: all JavaScript code is valid TypeScript code so it can be added seamlessly to any project. The TypeScript compiler emits JavaScript.

TypeScript is a superset of the JavaScript language. It differentiates itself from competitors like CoffeeScript and Dart in that plain JavaScript code can be intermixed with TypeScript. Therefore, JavaScript is TypeScript. But TypeScript has to be compiled into JavaScript before it can run in any JavaScript engine (web browser or node.js). This means you cannot embed TypeScript into a web page directly using <script> tags, but TypeScript (in .TS files) can get compiled into JavaScript (in .JS files) for usage.

TypeScript supports definition files that can contain type information of existing JavaScript libraries, much like C++ header files can describe the structure of existing object files. This enables other programs to use the values defined in the files as if they were statically typed TypeScript entities. There are third-party header files for popular libraries such as jQuery, MongoDB, and D3.js. TypeScript headers for the Node.js basic modules are also available, allowing development of Node.js programs within TypeScript.

First public version released in 2012 (TypeScript 0.8)

TypeScript 0.9 released in 2013, adding support for generics

TypeScript 1.0 released in 2014, including support baked into Visual Studio

TypeScript 2.1 released in 2017

TypeScript 2.6.2 – November, 2017 and

TypeScript 2.9.1 – May 31, 2018.

Typescript 3.1.1-September 27,2018

TypeScript 4.0.5 -October 26,2020 

What is TypeScript?

What are the features of TypeScript?

What are the components of typescript?

What are the main benefits of TypeScript?

Why use TypeScript?

What is TypeScript Declare Keyword?

Does TypeScript Support All Object-Oriented Principles?

What is inheritance in TypeScript?

What is a Module?

What are Modules in Typescript?

What is overriding in TypeScript?

For More:

What are the built-in types in typescript?

What is variable in TypeScript?

What are Classes in TypeScript?

Is it possible to debug any TypeScript file?

What is the extension supported by TypeScript?

What is scope variable? And what are different types of scope variable?

What is TypeScript Definition Manager (TSD)?

What is tsconfig.json File?

What is Duck-typing in TypeScript?

How can you get TypeScript and install it?

How to compile a typescript file?

What is the use of pipe symbol in TypeScript?

What is the syntax to declare Nested Namespace in TypeScript?

What is Static vs Dynamic Typing?