JavaScript Factory Functions

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JavaScript factory functions made simple.

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This is a good and clear lesson but I feel like you missed the encapsulation aspect of factory functions and how you can theoretically make methods and attributes private with it. That was the explanation I was looking for after reading some articles about it.

KanecoV

Very good explanation! As a guy who learned C++ now learning web development, I was trying to do OOP the way you would in C++ but I couldn't figure out how the JSON data I was working with have a variable named 'shoulder-length'. You can't use a hyphen in Classes... Found this video and immediately understood what was going on! I had never heard of factory functions.

kylehofmeister

Thanks I was a little stuck, this video helped it click. A few other videos I checked out weren't really explaining it simple enough. THANKS!

yummyjackalmeat

Brilliant! Can I ask why you removed the "location" parameter, I thought that would have been needed?

richochet

it's so useful, thanks for great teaching!

kengthe

Thanks, easy to understand even for non english speaking !

elora

hi, factory pattern is all about creating new instances for different classes in a single method. In this video, you are creating regular functions. Are you sure that this is the right way?

havetocheckhavetocheck

I've seen this video and the next one, I wanna ask is there an actual advantage that each of them have over the other?

joshel

Hi! What would you recommend? Factory method or class factory???

eunito

Hi Mosh, thanks for great videos. I have a question regarding methods. Is the method 'draw' in the above example duplicated on every object creation or is it created on the prototype? If it is duplicated for every object, then why should I favor factory functions?

aswink

Hi there, by declaring: function createCircle() { .... } aren't you attaching your function to the main Window and as I recall you said that is BAD PRACTICE? since this can create problems with your script if using libraries... or so...?

AndWhatNotFreeVideos

what do you use?
constructor or factory...

___vijay___

Has anyone noticed one thing? When you call

createCircle(1).draw();

though, it prints the message 'draw', the type of the draw() function returned in the browser console is 'undefined'. Why is it? Should it not be 'function'? Please explain why.

priyamganguly

Hi Mosh, great video!
Query: how do you add methods from OUDSIDE the function? Following your example in the video, I have used the below for both factory and constructor functions and it works, but I wonder if there is another way specifically for factory functions?

circle1.anotherDraw = function() {
console.log('Adding a new method');
}

circle1.anotherDraw();

AcidHouse

Thank you for this video! If anyone could help me though; I understand the javascript code in this video and I understand JS is a scripting language as to why it's in the console. But what is this code drawing? Is it drawing a circle on the screen? Or I guess my question is... where is the circle going to be at?

eryntodd