Immediately Invoked Function Expression - Beau teaches JavaScript

An Immediately Invoked Function Expression (IIFE) is a JavaScript function that runs as soon as it is defined.

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[ElrondMcBong]

Awesome. short, clear, to the point! thanks!

usefull extra-information!:
I had the first situation, where i got errors, caused by not using semicolons.
so after that self-calling function you HAVE to put the semicolon, since () followed by ( is valid syntax, and thatfore no semicolon is added/interpretet internally.

[joellim]

wow. normally when i watch JS videos on youtube, i don't understand what is happening at all. but i actually understand this video. this is amazing.

[harrazmasri]

my senior was using this and led me here. thanks

[victorfeight]

Very clear, and especially appreciate the new ES6 block scope syntax comparison.

[georgefox]

This was the video I needed to finally understand IIFEs, thanks!

[kuilyniroshan]

wow that was really clear, finally understood it!! thank you!!

[meeeeeraj]

best explanation this used to be super confusing for me thank you

[tungvuongtri]

You guys are the best, thank you for creating freecodecamp. And thanks Beau for making this video.

[mandihaase]

I finally think I understand IIFEs. Thank you!

[thematrixcam]

Thanks for actually helping me understand this

[pippinbloom]

This was very hepful. Thank you so much for taking the time to make this!

[tehrackoon]

This video explained the value of let and const to me in es6

[ozzyfromspace]

lol I've done this for years, didn't know it had a name 😂 Nice video, Beau!

[WiLDeveD]

Use Your Code For Good... Thanks Beau.

[randolphperkins]

Hello. Great video, and very useful. But two things: it was hard to follow because it seemed to be fast forwarded, and new concepts were being introduced in rapid succession, making it hard to keep up. The second thing is it was difficult to follow when the console log was halfway cut off of the screen and you kept jumping back and forth between the console and the environment. And yet, a whole wealth of black space exists in the middle of the screen. If you would just move the screen margins over so the viewer can see the whole environment and the whole of the console, that would be very helpful for comprehension.

[harmanpreetbhatti]

I think all the variables defined using 'var' are function scope in ES5 not global scope as you said @3:17

[BUCKTHEWORD]

Always wondered what this was Could you make a video on 'use strict';? Thanks

[bvsanchez]

For once Beu explains something well in javascript! yaaaay

[hooman]

Is the video being slightly fast-forwarded while he types?

[mega_]

Dude your videos are awesome. Question for you - with ES6, do we need to use IIFE much anymore if at all?