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You now know how to use the node module system to load in core node modules like the file system module
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and other files you've created like notes Doc J s in this video.
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You're gonna learn how to use the module system to load in NPM packages.
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This is going to allow us to take advantage of all of those awesome NPM modules from right inside of
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our node applications.
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There are an endless amount of awesome useful NPM packages that we can install so we don't have to recreate
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the wheel from scratch.
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There are things that pretty much every application out there needs to do.
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Examples would be validating data like emails and maybe even sending an email.
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These are core functionality not specific to what your application does for your users.
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So if we use NPM modules to solve common problems which is indeed the standard in the node community
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then we can spend our developer time focusing on the awesome features that make our app unique.
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So as I mentioned a bit earlier in the class when we installed node we also got the NPM program installed
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on our machine.
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This gives us access to everything over at NPM J S dot com which we'll head back over to in just a few
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moments.
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Now before we can actually use any of these modules in our script we have to take two very important
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steps.
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One we have to initialize NPM in our project then two we have to install all of the modules we actually
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want to use.
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So let's go ahead and see how that happens.
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First up let's initialize NPM in our project which means we have to run a single command from the project
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root that root directory is the notes app folder.
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So make sure you're running commands from there in the terminal down below.
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I am indeed accessing that directory.
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Now when we first installed node we got the version of node we were using by using the node command
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with the V flag when we installed node.
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We also got access to the NPM command line tools.
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We can run that with the V flag to get the version of NPM we're running.
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And right here you can see I'm running version six point four point one.
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Now the specific version of NPM you're using does not matter as long as you're using version 5 or greater.
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So as long as that first number is either 5 or higher which it should be you're good to go now from
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here.
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We have to initialize NPM in our project and we do that by running a single command from the root of
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the project NPM in it.
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This command is going to initialize NPM in our project and in the end of the day it's not going to do
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anything fancy.
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It is simply going to create a single configuration file that we can use to manage all of the dependencies
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from the NPM Web site that we want to install.
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So right here we're gonna go ahead and run NPM in it.
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Now it has a lot of information telling us exactly what's happening in the end of the day what's really
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going on is that NPM is asking us for some information to populate various fields in this configuration
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file.
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Now we can type out custom answers.
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So for example the first piece of information it wants is just a name for our package.
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So some sort of name for this project.
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Now by default it uses the folder name notes app.
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We can choose to use that by just hitting enter or we could type something custom to override that value
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for every single question it asks.
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We're going to stick with the default value so we have package name.
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I'm just gonna hit enter.
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We have a version we have description entry point test command get repository keywords author and license.
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Now there are a few of these fields we'll be exploring in detail later we'll talk about testing when
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we explore testing and we'll talk about the get repository.
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When we set up deployment many of these fields however are for folks who are creating NPM packages which
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is not what we're doing.
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We're creating a application on our own and we're trying to consume NPM packages so the values for many
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of these are not important for our purposes right here.
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We can hit enter on that last one and it's asking us if things are OK now what exactly is it doing well
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it tells us it's about to write a package dot Jason File to the notes app directory down below.
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If this is the exact contents it's about to write to that file.
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Everything looks good.
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We can type yes to confirm that we want NPM in it to actually create that file and now we have a brand
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new file in our project route.
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If I crack it open we can see that has NPM promised.
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It looks exactly like what we had output it in the terminal down below.
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The extension for this file is Jason which stands for a javascript object notation and as you can see
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it looks a bit like a javascript object.
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There are a couple subtle differences we'll explore as we use Jason throughout the class.
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It's something we're gonna be covering in great detail for now all you really need to know is that you
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have to use double quotes instead of single quotes and all of your property names like name or author.
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They also need to be wrapped in quotes like we're seeing here.
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If I were to remove the quotes from one of our property names like license this would be valid in javascript
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but we can see it's invalid in Jason.
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So let's go ahead and bring those back.
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Now this file is gonna be used to manage all of the dependencies that our application needs to run.
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So in here we're going to list out all of the NPM packages we want to use to start let's go ahead and
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move to NPM J ask.com and find a package we actually want to work with.
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Now for this example we're going to install the very popular validator package which gives us all sorts
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of awesome tools to perform data validation.
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So right here in the NPM search bar I'm going to search for validator and we're looking for that first
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result.
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The validator package.
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Now there are other validation packages out there.
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There's even one with a capital V.
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We want this first result lower case validator.
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Now when we click that it's going to bring us over to the NPM package page.
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This is a great page every NPM package has one and it gives us a ton of information about the package.
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We have the documentation for how to actually use it.
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And on the right hand side we have a bunch of great stats about the package.
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Things like the version number they get hub home page and the weekly downloads.
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This is a very popular package with over one million weekly downloads.
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So if you wanted to perform a little validation in your note app there are two ways you could go about
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that.
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The first approach would be to write all of the validation code yourself.
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You have to write the code you have to maintain it.
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You're going to want to write test cases for it to make sure there are no edge cases.
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And in general you're going to have to keep up with that code as node progresses over time.
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Now that's option 1.
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Now when you're creating an application I doubt that validation is what makes it unique.
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So if I'm creating a weight loss application as an example I likely have some sort of reason why I'm
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doing it.
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I have a model about either diet or exercise or habits that's going to help people lose weight in a
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way they weren't able to before.
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What makes my app unique is likely not how it validates emails.
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So sure you could write that code but it's a much better practice for a lot of these basic features
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to take advantage of a well tested NPM package like this one where millions of different applications
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and utilities are taking advantage of it all the time.
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Now that's not to say we're not going to write code.
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We are but for some things we're going to take advantage of other packages that allow us to get it done
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in a much more secure way.
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So in this case the validator package has all sorts of tools for validating emails.
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You are L's phone numbers social security numbers credit cards and other types of string information
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like that.
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Let's go ahead and install it and see how it works.
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Now what we're gonna do is note the package name because that is essential.
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You can actually see a command over here that we can run it to install it right here lowercase the validator
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is the package name that we need and we're going to head over to the terminal and install this.
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Now we want to run the command we're about to run once again from the notes app directory right here.
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That's npm install validator.
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Now you'll notice on the Web site they used NPM I validator.
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Those are identical.
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I is just a shorthand for install you're more than welcome to use either approach.
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Now from here we're going to specify the specific version we want to install.
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So at then the version number I'm going to be using the latest version currently available which is
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ten point eight point zero in this course I'm always going to specify package versions to make sure
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that we're always on the same page NPM modules do change their API over time so to ensure the video's
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always work I'll be lacking us into specific packages including updates when API is change.
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So right here this is the command we want to run.
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Now when we run this what's it going to do.
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Well it's going to go off to the NPM servers.
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It's going to grab all of the code for that package.
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And it's actually going to add it into our application and we'll notice that when we ran that command
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two things happened one we got a package hyphen LOC dot Jason File and two we got a new directorate
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a node modules directory.
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Let's take a quick look at both.
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First up node modules.
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This is a folder which contains all of the code for the dependencies we installed.
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So if I crack this open what do we have.
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We have a single directory validator.
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That's the package we installed.
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And if we open that up it's all of the code for the validator package.
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Now the node modules directory is something we should not be manually editing we should not go inside
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of validator and actually change these files and we'll talk more about that as we progressed through
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the course and learn more about package management when it comes to working with node modules.
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It's just going to get generated and edited when we run npm install commands.
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So we use npm install and NPM maintains this directory the same thing is true with package hyphen locked.
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Jason this is a file which contains extra information making NPM a bit faster and a bit more secure.
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It lists out exact versions of all of our dependencies as well as where they were fetched from.
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And we also have a char hash making sure that we're getting the exact code that we got previously if
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we were to install a dependency again.
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Once again this is not a file we should ever be editing.
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Once again this will be maintained by NPM.
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So we have our package installed and when we ran that command it was even added to package.
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Jason we have a dependencies property.
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We have our dependency name along with the version we installed.
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Now that we have it installed we can move into our node app a file such as app dot J.
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S and actually load it in with require and take advantage of some of the functionality it provides to
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load in an NPM package.
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We once again use require I'm going to add a second requires statement to this file right here.
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We're gonna go ahead and use require like we did previously and we are indeed going to pass in a string.
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Now for those core node modules we typed out the module name for our files we would start with DOT forward
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slash to provide the relative path to the file for NPM modules.
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We list out the NPM package name.
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So in this case that would be validator.
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And this is similar to what we do with those core node modules now require is going to return all of
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the stuff that the validator package provides us.
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So right here I can create a variable like validator that's going to store the contents that comes back
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from require.
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Now when it comes to figuring out how to use a given package this is when you just have to turn to the
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documentation to figure out how it was intended to be used.
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We're going to end up looking at the documentation for every tool we install.
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I'd like to point you towards the documentation since that's gonna give you all of the information you
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would need to learn more about how something works or to explore other ways a given tool can be used.
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Now for our purposes on the NPM package page we have all of the different ways that this tool can be
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used.
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If we scroll down to the validators section we have a method and we have a description of how it works.
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There are maybe a hundred different methods for all sorts of different things we can do.
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One of the methods is is email this allows us to determine if a given email is valid and that's something
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we are indeed going to take advantage of.
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This method can be accessed directly on validator which is an object.
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So let's go ahead and test this out.
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I'm going to add a console dot log called down below so we can print some output to the terminal and
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instead of creating a variable and then passing that into council dot log I'm just gonna call the function
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right inside of console dot luck.
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So right here validator dot the method name that's is email and we're going to pass in to that method
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call a single string argument.
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So right here let's go ahead and try something like Andrew at example dot com which it should indeed
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be a valid email as it contains all of the component pieces.
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Now let's run our application from the terminal down below.
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I'm going to clear the output using the clear command or CLSA on Windows.
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Then I'm going to run node with app dot J s when I do that.
193
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What do I get.
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I get my first piece of information from line 5 then I get true which is coming from line 7.
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So here we have a valid email.
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Now let's switch that up.
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I'm gonna remove Andrew and the at sign leaving just example dot com I'll save app dot J.S. again I'll
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rerun our script and this time we correctly get false the information passed in is no longer a valid
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email so is email returns true if the string is an email it returns false if the string is not and there
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we go we were able to install an NPM package load it into our node application and take advantage of
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it to do something meaningful.
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Before we wrap this one up let's go ahead and explore one more method.
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Right here we have an alphabetical list of methods.
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I'm gonna scroll down to is and we're looking for you.
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4 is you are all right here we have another method allowing us to determine if a given string is U.R.L..
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So let's go ahead and test that out.
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I'm going to remove is email something we'll be using later in the class.
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I'm gonna swap it out with is you are L..
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Then I'm gonna change the string value I provide.
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Let's go ahead and try my own site.
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You are l h t t P.S. colon forward slash forward slash meat dot I oh I'm gonna save the file I'm gonna
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rerun the program and this time we get true.
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Now I'm gonna mess that up maybe I'll do something like remove one of the colons and the forward slash
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I'll run the script again and what do I get I get false this is indeed an invalid you are out now when
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it comes to taking advantage of the documentation for a given package it's usually best to find an example
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sometimes the documentation itself doesn't really make it clear how something is to be used up at the
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top though we can see there are real examples similar to what we just did inside of our own project.
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Now you'll notice there are two versions here no iOS 6 and iOS 6.
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This is a note of course uses iOS 6 iOS 7 and more modern features throughout.
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The only big difference here is that up above we're using require which is what we're using in node
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and down below.
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They're using a slightly different syntax using the import keyword node currently does not support the
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import keyword support is coming for it later down the line and when it is supported I'll add a section
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covering it.
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But for now in node j us when we want to load something in reuse require.
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So right here this would be a great example to kind of help us figure out exactly how the package is
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intended to be used.
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That's where we're going to stop for this one.
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We have installed the package we've required it into our file and we've used it in the next video as
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a challenge.
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You're going to end up doing the same thing for a different library.
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I'm excited to get to that.
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So let's go ahead and jump right in to the next one.
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