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All right welcome back.

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So as I promised in the last video we're now done with just pure command line basics.

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We're going to continue to use all of the commands we talked about in pretty much every video.

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But they're not going to be the focus of the videos going forward.

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They're just now another tool for us to use as we learn new technologies the new technology that we're

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going to learn about.

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And this video is no.

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Yes.

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And before we get there I'm just going to make a new directory to put some files in.

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So I'm going to make directory intro to node just like that and then CD into intro to node just for

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more practice and I'll add a file objectives dot empty and this file won't actually do anything all

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that will use it for is a place for me to put some objectives so that we can guide what we're going

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to talk about in this lecture.

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So this is intro to node and there are just two main points I want to talk about.

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The first one is what is node.

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The second one is Why are we learning it.

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And then the very last point is it doesn't matter.

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So I'll come back to that at the end.

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So let's begin and talk about what node is.

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So you might have heard of node before and that's because right now it's the trendiest hottest thing

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in web development for whatever that's worth.

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We're going to talk more about why we're actually learning it.

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I assure you that it's not just because it's trendy but that is one reason that you may have heard of

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it before it's all over the place on blogs and books and all sorts of conferences node is all the rage

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.

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So what is node.

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I have the official know O.J.'s home page here.

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Node JS. dot org.

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And according to this page no J S is a javascript runtime built on Chromes V8 javascript engine no JSE

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uses an event driven non-blocking IO model that makes it lightweight and efficient no JSF package ecosystem

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NPM is the largest ecosystem of open source libraries in the world.

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So let me try and explain it in a simpler easier to understand way.

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Up until a few years ago all the javascript that you wrote had to run in the browser.

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It was the only place for you to execute javascript code and that meant that all javascript that you

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wrote was only front end code.

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You couldn't do anything server side because the only place that it could run is the browser.

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So that's what we've been doing up until this point.

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Writing our javascript in js files linking them through a script tag to an Tim L file an opening that

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in the browser but that all changed a few years ago when no genius came along.

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So all that note is is a way for us to write javascript code on the server side.

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So remember this diagram from the intro to back end lecture where I showed a generic stack where this

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line right here denotes the boundary between the back and or server side and the front end or client

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side before node came along.

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All the javascript we wrote was happening up here on the front it just like all of the JavaScript we've

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written so far.

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And then on the back end there were languages like Python or DHP or Ruby or Java but javascript was

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not an option.

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But no it changed all of that.

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Now we can write javascript code right here on the server side interact with our database to start a

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server to create new files and all sorts of server side logic and we can write javascript on the front

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end.

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So what that means is that we can now write javascript everywhere.

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Sort of wrap that up.

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I don't want you to get too hung up on the terminology of a javascript runtime built on Chromes V8 javascript

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engine.

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All that you need to take away for now is that node is how we run javascript on the server side.

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So that was the first point.

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What is node the next and probably more important point is why are we even learning it.

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So as I mentioned earlier node is definitely the hippest the trendiest it technology for people to be

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learning right now.

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But I'll say this right now that is the smallest reason why we're learning it so it's not something

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that we can ignore.

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But it is definitely the least important of the reasons that I'm going to mention.

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So add that here.

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It's popular.

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We can't deny that.

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I'll show you some stats and charts that reveal some interesting trends about how Noad compares to other

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similar technologies in the last few years.

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So what does it mean for a technology to be popular.

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The first thing that I'll mention is that node is definitely popular amongst existing developers.

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Almost everyone that I know who is an engineer or a senior engineer has picked up node on the side as

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something that they're interested in something that they want to learn about.

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They'll build side projects and act together things late at night which is always a great sign when

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there's a lot of excitement and buzz about our technology.

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But again I don't think that's a great motivation for you a beginner to learn.

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Note what this chart shows is just the rank of the ten most popular languages on get hub.

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Over the last seven years and you can see that in 2012 javascript overtook Ruby as the most popular

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language on all of get help.

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The last two pages I want to highlight I think are the most important here.

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They're from that web site stack share that I demonstrated earlier the last two pages I want to show

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are from that website Stex share that I introduced in the intro to back in video.

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And I have a search open for DHP which will pull into its own window and I have one for no yes as well

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and I want to just take a look at these key terms.

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Why people like HP and why people like No J us and there are good reasons on both sides.

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I don't want you to get the impression that I'm trashing peech or anything but I just do want to show

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a contrast in some of the reasons people like them so APHC some of the more popular reasons are large

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community which is definitely an important aspect.

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We also have that over here great community for Node 2.

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I want to highlight though our good old Web and Web Foundation as well as the best glue on the web.

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These are different ways of saying that ph V has been around for a long time and it's sort of the grandfather

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of web development if you will.

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Now let's take a closer look at some of the reasons people like Noad and some of the ones all highlight

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are great libraries which is really important and we're going to use some of those libraries.

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Javascript's that's the most voted or second most voted one and that's really really important.

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It's in javascript.

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People love javascript.

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We'll be able to write javascript on the server side.

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We don't have to learn another language.

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The other aspect is high performance and that's one of the reasons it's getting so much attention from

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companies and startups all over the world.

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What makes something higher performing or more performance is for another lecture entirely.

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But the fact that so many people have mentioned they like it for being high performance is a great indicator

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of the fact that it's high performance.

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So I spent the last few minutes trying to prove to you that note is popular it's trendy there's new

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jobs in it and it's only getting more and more popular.

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But I did start out by saying that that's not a reason really why we should be learning it.

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It's the smallest reason but the most important reason that we're learning it is that it's in javascript

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and that's important because we already know javascript.

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So we don't have to start from square one pick up another language.

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Learn how variables work in THP or in Ruby or in Python and how loops work and how arrays work and objects

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and oh wait some of these languages don't have objects and things just change so much.

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It can be very confusing for someone who's just starting out.

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Do you have to switch gears.

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One hundred percent and abandon javascript for you know the next half of the course until we bring it

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back at the end rather than doing that by using node.

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We're able to write javascript on the server side with the same exact syntax that we know and love.

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And I've been working with for the last half of this course.

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One of the phrases I would repeat to my students all the time is that you guys are not here to learn

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technologies you're not here to learn languages.

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You're here to learn web development and web development changes so fast you might go from a job where

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you're writing Ruby and using rails and then a year later you go somewhere else and you're asked to

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learn node and you're writing express or sales.

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Yes.

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And then a year later you're picking a python and flask and things can change all the time.

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So to summarize I'd say that it does matter in the short term.

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It is something that I mean I thought about this for a very long time.

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You know I'm fortunate I've taught things in C and in Java in Noad and Javascript in Ruby and Rails

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and Python.

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So it wasn't a matter of what I was comfortable teaching.

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I was able to pick what I felt would be best delivered through this video course.

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What would be the best first server side language for someone who has never done any server side programming

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and who is just starting out by using a video course.

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And I ended up setting a node.

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So it does matter in the short term but if you do continue with this it really doesn't matter.

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So I'll append this.

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It doesn't matter.

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Long term and that's true it really doesn't.

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This is just your first introduction.

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So it seemed significant.

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And it was certainly an important and significant choice for me to make and I thought a lot about it

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but for you once you learn node once you learn server side programming it won't be difficult to transition

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to something like Ruby or to Python.

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Hopefully this video got you at least a little bit excited about learning node and about making web

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apps.

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Because in the next video we're going to see our first taste of writing code using node