Functions in Javascript | Javascript Functions Tutorial

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In this video we'll look at examples of Functions in Javascript and learn how to create our own functions that are blocks of reusable code!
▶ This video is part of the JavaScript Tutorials for Beginners Playlist found here: • Javascript Tutorials f...
✅ Quick Concepts outline:
Functions in Javascript
(00:00) Intro
(0:15) Built-in Functions
(0:55) Functions are reusable code blocks
(1:12) Function Declaration Syntax
(1:20) Creating a Basic Function: sum()
(2:09) Calling a Function into action
(2:50) Passing Parameters to a Function
(3:30) Creating Reusable Code with Functions
(3:50) Missing Parameters
(4:30) Handling Missing Parameters
(5:20) Another Function Example: getUserNameFromEmail()
(7:10) Is it reusable? Yes!
(7:30) Anonymous Functions
(8:30) Arrow Functions
(9:05) Creating One More Function: toProperCase()
📚 Further Reading:
MDN Web Docs:
Functions: developer.mozilla.org/en-US/d...
Eloquent JavaScript Chapter 3:
eloquentjavascript.net/03_fun...
📺 More Beginner JS Videos:
freeCodeCamp: • Learn JavaScript - Ful...
Traversy Media: • JavaScript Crash Cours...
The Net Ninja: • Modern JavaScript Tuto...
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Medium: / davegray_86804
#Functions #Javascript #Tutorial

[@reked2605]

I love how you give a simple example and then a practical example that you would use in a real life scenario. So many tutorials don't do this... thank you so much

[@DaveGrayTeachesCode]

Glad it was helpful! 🚀

[@alan-overthenet]

Really good explanation and useful examples. Thank you, Dave

[@akshayasalaskar9102]

Thank you for such a simple explanation!!!!

[@StellaOloo]

Best explanation ever on functions ever!!! Thank you Dave Gray.

[@DaveGrayTeachesCode]

Glad it helped!

[@Cascadia2011]

Excellent explanation and a great teaching voice! Thank you 😊

[@DaveGrayTeachesCode]

Thank you!

[@fazzyakamello]

I’m so glad I bumped into your channel. Thanks to Traversty Media! Keep it up

[@DaveGrayTeachesCode]

Thank you!

[@srinivasaraoyp3640]

Very interesting and very important topic , thank you very much Dave.

[@DaveGrayTeachesCode]

You're welcome! 🙏

[@harapalb7]

Keep up the good work!

[@DaveGrayTeachesCode]

Thank you for the support 👍

[@CondeAlberto]

Well done as usual

[@DaveGrayTeachesCode]

You are making good progress, Alberto! 🙏💯

[@Grihlo]

Your method of explanation is just the best! No water, only essential useful and practical information. Thank you!
I wonder why is it preferrable to define functions with 'const' instead of 'let'?

[@DaveGrayTeachesCode]

Thank you! I always use const instead of let when possible. let indicates the value being defined could change. const indicates the value cannot change.

[@Grihlo]

@@DaveGrayTeachesCode thank you for reply! I posted this question before I watched another video where you explained in details the different ways to declare variables - var, let, const. Now I know the difference! Thank you again for proper explanation of basics!

[@jiweihe3413]

Thanks for these helpful videos. Is "return" usually removed from arrow functions? 11:30

[@DaveGrayTeachesCode]

Good question. If it is on one line, it can be omitted. If multiple lines, then it must be included.

[@omcinc]

Thanks for the great JavaScript series! I notice as you're typing JS code, you have a pop-up helper showing you a description of the method and parameters it accepts... What is this extension please?

[@DaveGrayTeachesCode]

I don't remember what I was using at the time. Search your extensions for MDN, and there are several options for this.

[@B-Billy]

Thanks for the video, however, are not the latter two "Fucntion Expression"?

[@DaveGrayTeachesCode]

It has been over a year since I made this tutorial, so I am not sure of the specific last two. That said, function expressions are still considered to be functions. I usually call them anonymous functions. MDN shares some distinction here: developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/function

[@aetherwebdev3620]

I'd say it's a Good Explanation.
But, aren't Methods Functions that are attached to a Class or An Object.

[@DaveGrayTeachesCode]

Yes they are. Objects and classes are covered in a later "chapter" of the playlist. However, some built-in string and math methods were covered in earlier "chapters" of the playlist. 👍