Node.js is a JavaScript runtime that is used to build server-side applications outside of the browser. Google’s V8 engine powers Google Chrome browsers, as well as, Node.js. All modern browsers come with their own version of the JavaScript Engine but the most popular one is Google’s V8 Engine. The JavaScript Engine is a program whose responsibility is to execute JavaScript code. If you missed it or need a refresher, be sure to read the first part of our series: How JavaScript Works Behind the Scenes. In this second part of this JavaScript tutorial series, we will focus on internal parts of the JavaScript engine and uncover why JavaScript is no longer an interpreted programming language. The first article of this series was an overview of the JavaScript engine, the call stack, and the runtime environment. Let is also used to declare variables(new way)Ĭonst is used to declare const values.Recently, we started a series aimed at teaching web developers how JavaScript works and what the different components that make the process of code compilation and execution in JavaScript fast and simple. Var is used to declare variables(old way of declaring variables) Executable in both browser and server which has Javascript engines like V8(chrome), SpiderMonkey(Firefox) etc.Embedded along with HTML and makes web pages alive.Javascript is required to design the behaviour of the web pages. Javascript(JS) is a object-oriented programming language which adhere to ECMA Script Standards.

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