JavaScript Question: What is a Decorator Function?

If you have been around coding for a bit, you may have heard of decorator functions. Well what are they and how do we use them? We are going to answer those questions in today's topic.

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Tutorials referred to in this video:

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[zbjptid]

One of the best JS tutors out there. Thank you for everything that you do. :)

[Videosuser]

Your simple definition of this pattern helped me a lot. Thank you. I hope you continue to make videos, especially intermediate/advanced ones.

[asemzk]

The decorator functions returns undefined now

You should have added:
return fn(...args);
In line 7

[Rudxain]

I've been using these sometimes but didn't know they were called like that!

[astigmatik]

Can you show practical examples on how to use this?

Also, is there a difference between the two:

const something = function () {};

function something() {}

[irlshrek]

I didnt know this was a thing! now I gotta think up clever ways to use this! thanks.
Theyre like functions on functions instead of data...meta functions. right?

[ScottL]

Think a more practical example would be useful.