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And before we move on to built in modules as well as third party modules, let me throw you a grade

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and I'm going to start by removing this console log in the app, Jayesh Weichsel.

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And I'm going to create a new file with the same exact name in mind.

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As always, if you would like to call this differently, that's totally your option.

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And I'm going to go with mine grenade.

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So jazz and I'm just fine will create some basic functionality.

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And by the way, let me save up jazz, so let's go with const num.

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One is equal to five online const and two is equal to ten.

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Of course there has to be a function that has these values as always with every tutorial.

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So we'll go with our values just for the sake of it.

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I'm just going to go with good old function keyword and the old setup, meaning not the arrow function

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syntax and simple here will go with the string.

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The sum is Colan.

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Let's go for template literal and I'll say Namwon plus number two.

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And instead of setting up the exports I'll simply invoke and values and I'll throw you that migranyan

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that I was talking about.

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Where in the app.

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Jayesh.

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I'm not going to sign to anything, I'll simply write require and then we'll go with my Internet and

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I'll let me comment out of these three cents at the moment, they all just overpopulate the console.

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And again, let's run Noad and Abcess.

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And once we're on our code, we can clearly see in the console something pretty interesting.

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Where we have a log of a sum is 15.

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So what's happening over here?

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Well, when we are setting up everything, if we have a function inside of the module that we invoke,

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yes, that code will run even though we didn't assign it to a variable, as you can see clearly here.

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And we didn't invoke that variable.

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And before we go any further, let me mention three things.

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First, it's not unique.

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You can also do that in six modules.

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And if you took my vanilla JavaScript course, you know that we use that functionality.

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Number two.

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Yes, throughout the course here and there, we will use this particular setup.

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Now, it's going to be with third party modules.

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And of course, once we get there, I will remind you about the set up.

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So that's how it works.

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And third, I wouldn't suggest losing your sleep over it.

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Just please remember that when you import a module, you actually invoke it.

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And this is really going into weed.

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But the reason why that happens is because this code is not just export it on its own.

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When the node exports this, it actually wraps it in the function.

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So that's why when you're required, you do invoke the code if you have some kind of function that actually

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is executed here.

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Keep that in mind.

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Not talking about exporting something, talking about executing function here and there.

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And of course, in this case, you need to use the imagination that will do something way more useful

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than this.

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At this point.

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You are looking at it, OK, I could have just set up that function in objets, and you're 100 percent

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correct.

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This is the place where you definitely need to use your imagination, where the functionality will use

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it for is going to be way more complex.

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But the idea is going to be similar where you just require some kind of module.

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And behind the scenes, that module will do a bunch of cool stuff.