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In this section I’ll cover the basics of

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JavaScript and Node.js.

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Node.js is a runtime environment for running server-side JavaScript and we’ll be using

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node.js throughout this course for all the demos and exercises.

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If you are well versed with node.js, feel free to skip this section of videos, although going

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through them won’t hurt.

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So, let’s get started.

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First, I hope you have node.js installed on your computer.

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If not, please go back to the Environment Setup video from the very first section of

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this course.

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It explains how to install node.js on your computer.

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You’ll also need a suitable text editor or IDE.

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I’ll be using VS Code for all the demos in this course and you can use any text editor

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or IDE of your choice.

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Once you are ready, let’s continue further.

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I have created a new folder on my computer

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called node-training to store all our node training projects.

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Let’s create another folder within this folder called hello world, hello hiphen world.

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This folder would serve as our first project.

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Right click and open this folder with VS Code.

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If you are using any other IDE, you could simply create a new file called app.js in

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this folder and open it for editing.

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So, I am going to create a new file in our hello-world folder and name it as app.js

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In the file, let’s type in console.log, open parenthesis and quotes, and type in Hello

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World and end with a semi-colon.

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Save the file.

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Open the terminal or command prompt, and be sure you are in our project’s folder i.e. hello

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world folder and run node space app.js i.e. node space the name of our main file.

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You can skip the dot js part and simply run node space app and hit enter

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And you should see Hello World printed in the output.

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That was pretty easy, right?

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As we move ahead in the course, the complexity would of course increase, though, I will do my best

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to make even the complex stuff as easy as possible for you.

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So, let’s keep going.

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As I mentioned earlier, Node.js is a runtime environment for running JavaScript on the

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server side.

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Until before Node.js was introduced, JavaScript was only used on the client side for client-side scripting, meaning

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it could run only in the web browser.

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Different browsers use different engines to run JavaScript.

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For example, Microsoft Edge uses Chakra, Mozilla Firefox uses SpiderMonkey, and Google Chrome

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uses V8.

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Node.JS simply uses Google Chrome’s implementation of JavaScript engine i.e.

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the V8 engine.

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And Node, of course has adapted the V8 engine to suit server-side processing.

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So, some browser-specific functionality like window or the document object is not available

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in Node and similarly not all Node.js functionality would be available on the on client-side in the browser

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for obvious reasons of course.

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To be able to work with node, we don’t really need to go in detail as to how node works.

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As long as you can write JavaScript, it should be easy to write your code to run on Node.

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And we’ll cover the basic JavaScript constructs as well.

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So, you don’t have to worry about not knowing JavaScript.

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So, let’s keep at it.

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To practice Node.js, you don’t need to rely on a

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text editor or an IDE.

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You can even run it with a command prompt or terminal.

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Let me show you what I mean.

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Open up the command prompt or terminal, or you can even open PowerShell if you like and type in node

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and hit enter. This would take you to node’s shell.

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You can write just about any JavaScript here, just like we did in the VS Code editor and test it.

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So, let’s try hello world again.

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Console dot log, parenthesis, quotes, hello world, semi-colon at the end and hit enter.

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And you get the same output as we got in the VS Code.

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This could be handy if you have to quickly test out your script without having to create

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a new JavaScript file or a new project.