what is JavaScrip?where does JavaScript code run

What is JavaScript?

what is JavaScript, JavaScript is one of the most popular and widely used programming languages within the world immediately it's growing faster than the other programming languages and large companies like Netflix, Walmart and PayPal builds internal applications around javascript.

The averages salary of a JavaScript developer in the United States and it's only $2,000 a year so it's a great opportunity to get a good job out of learning JavaScript.

You can work as a front-end developer or a back-end developer for a full stack developer who knows both the front end and the back end now the second question of what can you do with JavaScript for a long time javascript was only used in browsers to build interactive web pages.

those days are gone due to huge community support and investments by large companies like Facebook and Google, lately, you'll build a full-blown web or mobile apps also as real-time networking applications like chats and video streaming services command-line tools or maybe games.

where does JavaScript code run? 

javascript was originally designed to run only in browsers so every browser has what we call a JavaScript engine which will execute JavaScript code.

For Example, the JavaScript engines in firefox and chrome are SpiderMonkey a really clever the engineer called Ryan Dahl took the open-source JavaScript engine in chrome and embedded it inside a C++ program he called that program node the node is a C++ a program that includes Google's, JavaScript engine now with this we can run JavaScript code out of a browser so we can pass our JavaScript code to the node for execution and this means with JavaScript.

We can build the backend for our web and mobile applications so in a nutshell JavaScript code can be run inside of a browser or in node browsers and node provide a runtime environment for our JavaScript code and finally, the last question is the difference between JavaScript and the script.

The script is just a specification javascript is programming the language that conforms to this specification so we have this organization called a comma which is responsible for defining standards they take care of this Eggman script.

Specification the first version of Eggman script was released in 1997 then starting from 2015 ACMA has been working on annual releases of the newest specification so in 2015 they released a kimono script 2015 which is also called ECMO script version 6 or es6 for short this the specification defined many new features.