Thank you! I kept running into these terms while studying objects, and no one seemed to really explain it.

These fine details can not be found elsewhere except in your channel. Your tutorials give me great power to face my real world problems. Thank you so much!

Why are you not famous yet.. ? Best Prof !

I really really like this! I mean it's still something that I will need to rewatch but this is by far the best and clearly articulated explanation I've found thus far!

Gold mine content available for free. Thanks you so much

easy and clear english and expalination. as a second language user, can understand everything thanks!

Thank you so much, you just helped me understand in less than 10 minutes whtat took me the last 2 hours NOT to understand. Video liked and subscribed

This is an excellent explanation. Thanks.

Such an confusing concept got cleared after watching your video.. thank you..

Thank you for this video 🙌

Wow great explained 🙂

It helped to understand something more than my guru

Great Video, very insightful and clear

Awesome...Really nice and clear explanation

Thank you , this was extremely concise and helpful!

So glad I came across your channel Steve, only regret is that I didn't find it few years ago! Is there a way users can make a donation to your channel?

Another very cool tutorial!

Thanks. You are awesome

Thanks! Awesome explanation!

Great and brief explanation!

Practically it was really well defined but the main question still remains what is enumerable?

Thanks , For Good Explanation

Very clear, thanks so much!

Brilliant explanation! Thanks

Awesome!! clear explanation

Thanks !

Many thanks for making these awesome videos, Steve - much appreciated! Just wondered what's the difference between using 'Object.defineProperty' vs 'names.elf' as per this example, please? What you've done using 'Object.defineProperty' can also be achieved by writing 'names.ent = {value: 'Treebeard', enumerable: false}, is that correct? Thanks in advance.

Hi Steve, My understanding of iteration is the ability to loop over. So since we can iterate an Object using for...in, how come Objects are classed as not iterable by default? Just struggling to get my head around that bit. Many thanks.

Great tutorial, thanks a lot!

What are some situations in which you'd want to purposely make a property non-enumerable?

Where does one learn all this? I would love to learn all these in depth concepts by myself. Can you please refer me some resources where you learned all this from.

pheew...! I finally got it well explained thankx....

I am confused. You compare in the title of the video between two things that aren't the opposite, because 'iterables' describe (objects!!) that are iterable, while 'enumarables' describe the (properties!!) of an object. My unresolved questions: 1. Are the properties or the values called 'iterables' as well? Because you once said this and once that. 2. I think the topic of the video should have been for...in loops VS for...of loops, and not iterables vs enumarables. 3. If I want to sum up this video, would it be right to say: Iterables describe objects that are iterable. Enumarables describe the properties of an object, therefore they're called 'property descriptors'. **for ... in loop**, loops over the properties that are enumerable. In other words, we can access them and write them out. **for ... of loop**, loops of the values there are returned by an iterator object built in the object we're iterating. Arrays, maps, sets, strings all have built-in iterators. When you add properties to an object they can be defined as enumerable or not. Iterable object means that the object has a specialized function called an Iterator which decides which properties and in which order are available from the object.

You are a king.

So in summary, iterable object will have access to only values and enumerable will only show properties?

Danke!

Your Videos Are Legendary Man!!!!!!!! Can you help Me? Use Plotly for Android Apps is permitted? I wanna use plotly for my analysis in my android app and publish in Google Play Store and IOS AppStore, Is that Acceptable to use plotly inside my Android App as well as IOS App, Or Is there any subscription to use Plotly in Android App,I didn't get into my mind by reading the license, Please answer in layman terms and answer will be very useful for me. Thank you in advance!

So, iterable refers to the properties (i.e. index), while enumerable refers to the values assigned to those properties?

great

I'm sorry but I'm a really really dumb one. So there's no way to, let's say, get middleEarth[0], right? Or to iterate with a regular for loop?

gist?

ty

didnt understand a thing

best thx

The extremely gooey mouth of yours is in the microphone. keep that out please!!

// for of vs. for-in loops // Iterable vs. Enumerable //for in is looking for all of the enumerable properties (not the values) of the object and loops through them let names = ["Gandalf", "Bilbo", "Aragorn", "Gimli"] names.elf = "Legolas" Object.defineProperty( names, "ent", { value: "Treebeard", enumerable: true } ) let middleEarth = { "towns": ["Hobbiton", "Rivendell"], "races": ["Elves", "Hobbits", "Men"] } middleEarth.creator = "JRR Tolkien" Object.defineProperty(middleEarth, "age", {value: "3rd", enumerable: false}) for (let p in names){ console.log("in names: ", p) } for (let p in middleEarth){ console.log("in middleEarth", p) } //Iterators //The for of loop is designed to use the iterators. An iterator is another object attached to the array that tells some other function how to access all the different values inside it. //Arrays, Strings, Sets, Maps, and NodeLists have built-in Iterators. Object do not (must be custom made) for (let p of names){ console.log("in names: ", p) } for (let p of middleEarth.towns){ console.log("in middleEarth", p) }