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Welcome back. Let's expand on our Node knowledge from the previous video and actually create a script file

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that we can run.

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Let's just do the 'touch' command here again to create a file and we'll just call it 'script.js'.

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You'll see over here on the left-hand side that I have 'script.js' in my Node folder.

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Now within this folder I can now do anything in JavaScript.

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I can say 'const a = 5'.

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And that's not the folder that I want ... we want to open this and we'll say 'const a = 4' 

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'const b = 5'

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And then we can just 'console.log(a + b)'. If I save this in order to run this script,

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all I do is 'node' and then the script name: 'script.js'.

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And because we're in the directory it'll know what 'script.js' is.

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And it'll give us 9.

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How cool is that?

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Now you also see that it exited; it didn't stay in the program, and that is because at the end of the

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file, once it reads everything and executes it

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– so the last thing it executes is 'console.log' – it runs 'process.exit' and exits out of the file. Let me show

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you something.

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If I did something called 'setTimeout', which we actually have in Node; if I do 

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'node' 'global.setTimeout', I get a function.

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So if I do 'setTimeout', I can run a function again using our arrow functions.

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And within here I can do 'console.log()', and 'setTimeout' is cool because it allows you to say, "hey, when

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do you want this to be executed?"

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And that's the second parameter and I'll say 3 seconds.

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So if I save and I do 'node script.js' – one, two, three, and there you go: 9, and then 'process' exits

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Node is smart enough to run through this

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once this is done, ends the process and comes back to the Terminal.

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Very cool.

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And again within node we can actually use

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things that might be useful for us based on what global objects we have.

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For example one of the most popular ones are '__dirname' - if I save this and run

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'node script.js' ...

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I get my directory: 'node'.

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And I'll show you why that's useful when we start building a server.

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But as you can see, we have the power of the browser and running the scripts that we want right here

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in our Terminal.

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I'll see you in the next video, bye-bye.