https://github.com/seema1711/typescript-hello-world

https://github.com/seema1711/typescript-hello-world

Last synced: about 1 month ago
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• Host: GitHub
• URL: https://github.com/seema1711/typescript-hello-world
• Owner: seema1711
• License: mit
• Created: 2021-01-11T16:04:54.000Z (almost 4 years ago)
• Default Branch: main
• Last Pushed: 2021-01-11T16:35:33.000Z (almost 4 years ago)
• Last Synced: 2024-08-03T13:33:18.679Z (4 months ago)
• Language: TypeScript
• Size: 1.95 KB
• Stars: 0
• Watchers: 2
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# Write Hello World in TypeScript

## What is TypeScript?

> “TypeScript is JavaScript for application-scale development.”  

TypeScript is an open-source programming language. It is developed by Microsoft. 

It follows JavaScript syntactically but adds more features to it. It is a superset of JS. 

![TS and JS](https://qph.fs.quoracdn.net/main-qimg-1bb226be271cbb969e55513384f2401d.webp)

## Feature of TS

- Purely object-oriented, with features like classes, objects, and interfaces like Java

- TypeScript supports other JS libraries

- Any valid .js file can be renamed to .ts and compiled with other TypeScript files

- TypeScript is portable

## Running a TS code

**Browsers natively does not understand typescript, but they understand javascript. So in order to run typescript codes, first it is transpiled to javascript.**  

**tsc** : is a typescript compiler(transpiler) that converts typescript code into javascript.  

You can install tsc by running following command:

```npm install -g typescript```

## Write your first program

1. Create a file named "helloworld.ts".

2. Add these lines of code.

```

var greet: string = "Greetings"; 

var message: string = "MLH Local Hack Day!"; 

console.log(greet + " from " + message); 

```

3. To compile, run the following command:

```tsc helloworld.ts```

This command will generate a javascript file with name helloworld.js  

4. Run the javascript file using the following command on command line :

```node helloworld.js```

5. Output:

```Greetings from MLH Local Hack Day!```