Quick Answer: How does JavaScript work and where the code runs?

Where does JavaScript code run?

JavaScript runs in every web browser, out of the box. A JavaScript application runs on every device, whereas a desktop or mobile application runs only on the application it is targeted to (Windows, Mac OSX, Linux, iPhone, Android). This allows you to write cross-platform apps in a really easy way.

How does JavaScript execute your code?

To execute JavaScript in a browser you have two options — either put it inside a script element anywhere inside an HTML document, or put it inside an external JavaScript file (with a . js extension) and then reference that file inside the HTML document using an empty script element with a src attribute.

Does JavaScript run on client or server?

JavaScript is a client-side script, meaning the browser processes the code instead of the web server.

How do I test my JavaScript code?

How to Test JavaScript Code in a Browser

  1. JSFiddle. Whether you are working with JavaScript or frameworks like React and Vue, JSFiddle is the tool for you. …
  2. Cross Browser Testing Tools. …
  3. Karma + Jasmine + Google Chrome. …
  4. CodePen. …
  5. JSBin. …
  6. Liveweave.
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How do I test JavaScript in chrome?

Activate JavaScript in Google Chrome

  1. On your computer, open Chrome.
  2. At the top right, click More. Settings.
  3. Click Privacy and security. Site settings.
  4. Click JavaScript.
  5. Turn on Allowed (recommended).

Is JavaScript front end or backend?

JavaScript is used in both Back End and Front End Development. JavaScript is used across the web development stack. That’s right: it’s both front end and backend.

Can I run JavaScript locally?

Running a JS program from the command line is handled by NodeJS. Start by installing NodeJS on local machine if necessary. Now simply open the command line in the same directory as the index. js script you created (VS Code will do this automatically with the integrated terminal).

Is JavaScript is client side or server-side?

JavaScript is an important client-side scripting language and widely used in dynamic websites. The script can be embedded within the HTML or stored in an external file.

Is JavaScript always client side?

Client-Side JavaScript (CSJS) and Server-Side JavaScript (SSJS) are dependent on the core JavaScript and cannot work without it. For most part in the modern web, javascript is 99% times client side (yes I made up the statistic). That said, javascript is just another language.

What is the main use of JavaScript?

JavaScript is a text-based programming language used both on the client-side and server-side that allows you to make web pages interactive. Where HTML and CSS are languages that give structure and style to web pages, JavaScript gives web pages interactive elements that engage a user.

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How do I test my code?

Testing Your Code

  1. A testing unit should focus on one tiny bit of functionality and prove it correct.
  2. Each test unit must be fully independent. …
  3. Try hard to make tests that run fast. …
  4. Learn your tools and learn how to run a single test or a test case.

Can you run JavaScript in Visual Studio code?

JavaScript in Visual Studio Code. Visual Studio Code includes built-in JavaScript IntelliSense, debugging, formatting, code navigation, refactorings, and many other advanced language features. Most of these features just work out of the box, while some may require basic configuration to get the best experience.