TypeScripts

1. What Is TypeScript?

When the JavaScript was developed then JavaScript development team introduced JavaScript as a client-side programming language.

But when people was using JavaScript then developer get to know that JavaScript can be used as a server-side programming language also. But When JavaScript was growing then the code of JavaScript became complex and heavy. Because of this, JavaScript was even not able to full fill the requirement of Object-oriented programming language. This prevents JavaScript from succeeding at the enterprise level as a server-side technology. Then TypeScript was developed by the development team to bridge this gap.

2. What TypeScript Really Do?

-- TypeScript Code is converted into Plain JavaScript Code:: TypeScript code is not understandable by the browsers. That’s why if the code is written in TypeScript then it is compiled and converted the code i.e. translate the code into JavaScript.The above process is known as Trans-piled. By the help of JavaScript code, browsers are able to read the code and display.

-- JavaScript is TypeScript: Whatever code is written in JavaScript can be converted to TypeScript by changing the extension from .js to .ts.

-- Use TypeScript anywhere: TypeScript code can be run on any browser, devices or in any operating system. TypeScipt is not specific to any Virtual-machine etc.

-- TypeScript supports JS libraries: With TypeScript, developers can use existing JavaScript code, incorporate popular JavaScript libraries, and can be called from other JavaScript code.

3. Advantages Of Using TypeScript Over JavaScript 
 -- TypeScript always point out the compilation errors at the time of development only. Because of this at the run-time the chance of getting errors are very less whereas JavaScript is an interpreted language.

-- TypeScript is nothing but JavaScript and some additional features i.e. ES6 features. It may not be supported in your target browser but TypeScript compiler can compile the .ts files into ES3,ES4 and ES5 also.

-- TypeScript has a feature which is strongly-typed or supports static typing. That means Static typing allows for checking type correctness at compile time. This is not available in JavaScript.

               Generally TypeScript takes the time to compilation which is the disadvantage of TypeScript.

4. Installation For TypeScript

TypeScript can be installed through three installation routes depending on how you intend to use it: an npm module, a NuGet package or a Visual Studio Extension.

If you are using Node.js, you want the npm version. If you are using MSBuild in your project, you want the NuGet package or Visual Studio extension.

You can use npm to install TypeScript globally, this means you can use the tsc command anywhere in your terminal.

To do this, run npm install -g typescript. This will install the latest version.

You can install TypeScript as a Visual Studio extension, which will allow you to use TypeScript across many MSBuild projects in Visual Studio.

The latest version is available in the Visual Studio Marketplace.

5. Simple Program And Compile Process For TypeScript

6. Import And Export In TypeScript

The export statement is used when creating JavaScript modules to export objects, functions, variables from the module so they can be used by other programs with the help of the import statements.

For export the Syntax is:

For import :

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