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What is JavaScript?

What is JavaScript? 

JavaScript is a very powerful client-side scripting language used to create and control dynamic website content or enhancing the interaction of a user with the webpage. In other words, you can make your webpage more lively and interactive, with the help of JavaScript. The usage of JavaScript is not limited inside browsers. You can use it in server and console environments with Node.js.

JavaScript is also being used widely in game development and Mobile application development. JavaScript can be used to perform more advanced tasks such as printing the time and date, creating a calendar, or other tasks that are not possible in HTML.

In 1995, Netscape Communications hired Brendan Eich to add a new language to Netscape Navigator, the most popular web browser of the day. Netscape wanted to augment the programmability of the web.

The result: LiveScript was released in late 1995 with a beta version of the browser and was renamed JavaScript before the final release to capitalize on Netscape’s partnership with Sun Microsystems, the company behind the popular Java language (although JavaScript has essentially nothing to do with Java).

Common uses of JavaScript include:

  • Alert messages
  • Popup windows
  • Dynamic drop-down menus
  • Form validation
  • Displaying date/time

JavaScript usually runs on the client-side (the browser’s side), as opposed to the server-side (on the web-server). One benefit of doing this is performance. On the client-side, JavaScript is loaded into the browser and can run as soon as it is called. Without running on the client-side, the page would need to refresh each time you needed a script to run.

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