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Welcome back.

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It's time to learn Node J.S. now, no, we've kind of used it in previous videos, but we haven't really

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explained it.

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So throughout this section, we're going to learn what it is and finally use it to build a server.

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Now, we may have mentioned this before, but node is JavaScript that runs on your machine.

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You see, up until node was created, you could only run JavaScript in the browser because the browsers

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were the only ones that had a JavaScript engine like V8.

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And no GST was created with the V8 engine in order to be able to run JavaScript anywhere, including

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your computer, including our robots and anywhere as long as you had no gas.

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And as a matter of fact, we've been using node this entire time in our terminal when we ran commands

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that AMPM gave us like Create React app.

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Well, that was using Node.

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We were running JavaScript outside of the browser.

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And no gas is probably the most popular for building servers.

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It's really, really fast, and more and more companies are using it now as a backend server because

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of the way that it's built.

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No gas is probably the server of choice for any web apps or mobile apps out there that want to create

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an API or server.

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And it's also really, really good at building chat applications and real time communication.

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Anyway, as we've mentioned before, you probably should have this on your computer by now, but if

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not, you can download Node.js.

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I like using the Altius version.

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But as long as the version that you're using is higher than eight point nine point three, this demonstration

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will work for you.

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Notice really, really good at making sure that everything is compatible.

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Again, if you're using a Windows operating system, then Node provides that for you in the download

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section as well.

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And again, to check node, it's very easy, we just do note dash fee to see that we have it.

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And if you do have it, you'll have the version number printed for you on the console.

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One last thing before I show you some note commands, like I said before, note can be run anywhere.

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And one of my favorite things to do with note other than built servers is to actually create robots

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using JavaScript.

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This Johnny five is a JavaScript library that you can use with Node, and if you have something like

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a Raspberry Pi.

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It helps you build functions using JavaScript that robots can perform so highly, highly recommended.

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After this course, if you want to explore more, Johnny five is one of my favorite things, and it's

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surprising how easy it is to build a robot that does whatever you wanted to do just using JavaScript.

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But anyway, let's go back to note.

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In your terminal, if you actually type in Node and press enter, you'll see that the prompt changes

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now.

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And I can run node in the terminal if I do console the log.

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I get high if I do four plus five.

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I get nine and if I do bullion.

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Three.

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They spell the harangue bullion.

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Three, I get true.

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As you can see, we're just running JavaScript.

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But there is a bit of a difference here.

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If I type in window, I get a reference here.

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Window is not defined.

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And let me clear this a little bit.

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This is because when we run node.

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We don't have the window object, the window object was provided to us by the browser and as you know,

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note, well, there's no browser that's running it.

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Instead, note comes with something called global.

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And you can see that this global has just like the window object, had a bunch of things that we can

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use, but it won't have browser specific things.

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For example, we won't be able to have global sport fetch.

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It's undefined because, well, it doesn't exist that was provided to us by the browser.

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We also don't have the document object.

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If you remember, if I do document again, I get a reference error because, well, there's no document,

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so that's something to keep in mind.

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Node comes with its own properties and methods that we use.

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But other than browser specific things, we can do anything we want with note.

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One of the global objects that we have is something called process.

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If I press enter again, I have a ton of stuff, and in node process means this process, what I'm running

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right now in the terminal is the process, what the computer is doing.

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All right, and let's just clear this.

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Now if I do process Scott exit.

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I exit this process, and now I'm back to my terminal.

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Now that we have node in our power, we're going to start writing some scripts and show you how we can

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start writing actual JavaScript, not in the terminal, but in sublime text.

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I'll see you in the next video.

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Bye bye.