JavaScript Tutorial For Beginners #20 – Functions

Hey class, so in this JavaScript tutorial I want to introduce you to the world of functions. Yep, I think you’re ready for them :). Functions allow you to chunk parts of code together into logical sections, and call that code at any time. For example, you may have a function to cycle through all of your images on a web page, and implement a zoom functionality on the. You’d probably call this function something like imageZoom.

So, functions are a really cool and integral part of JavaScript, and something you should try and get into the habit of using early on in your JavaScript development, so that your code is always readable and tidy for yourself and other developers.

At first, functions in JavaScript can be a tricky concept, so by all means fire away with any questions you have down below :).

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Comments

Eduardo Bianchi says:

July 1, 2018 at 4:45 am

why do you used the return thing to average? didn’t understand that part, what woudl happen if you just put return?

Bruno Morais says:

July 1, 2018 at 12:22 pm

why does brackets keep giving me error in the words document and console? it says they are not defined

lardosian says:

July 1, 2018 at 1:41 pm

could you say ‘var myResult = average’;

Md Rohim Sikder says:

July 1, 2018 at 7:05 pm

nutshell mean in your video? Nice video and great explanation…………………….

Desig9stein says:

July 2, 2018 at 7:06 am

Thanks for the tutorial, this is the best explanation that i found so far. I will definitely recommend you channel

daren tan says:

July 2, 2018 at 11:14 am

Hi there, thank you for the video upload. May I ask what does “return” do? When is it necessary to include “return”?

Thank you!

Harman Jolly says:

July 2, 2018 at 2:20 pm

why doesnt myresult hv hv dese () in console.log like myresult();

ProPavGaming says:

July 3, 2018 at 2:34 am

At around three minutes in, could you have the “average” variable as a local variable? Then in the code block, you can just say “average = (a + b) / 2”?