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Hello, everybody, and welcome to the practice, they are offset collections, so please open your

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project, Invitrogen, which is learning.

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All right, just opening right now.

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All right.

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And then create a new file with a substantial name collections.

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SAT practice, all right, first of all, as always, let's leave a meaningful comment for the future.

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All right.

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So that's Data-Collection set.

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Practice.

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All right, so first of all, I ask you guys to create a collection of drinks, so let's do that.

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So first mission is to create a new set.

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Collection of drinks, right?

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So it goes like this, drinks curly brackets and then inside quotation marks with both the items as

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we learned in the previous lecture, then we have Sprite and then we have.

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Beer.

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All right, so just be careful, because beer is for 18 plus age, at least in my country.

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And now we have water.

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And now we have.

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Soda.

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All right, so like that, and then I asked you to add additional sale containing soda value.

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All right.

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As you recall, we had like a note here that if you had another sale of soda, we already have soda

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sale right here.

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So it would be a duplicate and set does not like duplicates.

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Right.

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But with that said, let's add it.

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All right.

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Add additional sale with soda value.

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So how do we do it?

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We just mention the asset collection then that then we have all these options open up for us.

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And by chance and we just want to add here a new item.

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So we just choose this one.

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Add sorry, and we use we choose the add one and the inside here.

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We just add whatever we want.

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In our case we add soda and after we added soda, let's try to print that print or even go.

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By the way, I forgot to print here.

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All right.

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Said.

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Collection brings out.

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Right, casting.

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And drinks I so want and output for all of our actions, this would be Simon number one, this would

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be assignment number two like that.

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And printing green.

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Printing drinks.

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After adding.

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An additional solar cell like that.

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All right.

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So now we do the casting, then drinks, and once we do it, anyone can tell what will happen.

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We said that Seth Collection does not like duplicates, so let's try to print it and see what happens.

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OK, so this is the first one we see over water, cola, soda and Sprite, and here we see beer, water,

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cola and Sprite.

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So what what just happened for us?

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Nothing happened.

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Nothing, because once we use the add action key correction identified that we already have this soda

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item inside our collection and it just did not edit at all to our collection.

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So this is an important point.

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If someone asks you what will happen to a cell collection, if you add additional sale with the value,

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with a value that already exist inside the collection.

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So your answer would be nothing.

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Nothing will happen.

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All right.

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So after this, we had assignment number three.

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And on assignment number three, we had to delete soda out of the set collection.

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All right.

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So how do we do it?

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We just mentioned the collection.

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Then we put the dot and now we have all the actions and we just choose a remove here and we inside quotation

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mark.

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We just mentioned what we want to delete.

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In our case, it is soda.

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And then let's just try to.

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Brent drinks.

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After deleting solar cell.

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All right, so it's right here and Los.

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Plus, SDR drinks and just Clow or so, then just close it, the brackets sprinted.

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See what happens right here.

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All right, so we have deleted the soda out of the collection.

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So as you can see, this also indicates that once we try to add here additional sale, it was not like

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invisibly added because we already have one.

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So it's like added what we can see it.

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It was not added at all.

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And why am I seeing it?

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Because right here, when we delete it so that we do not see it.

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All right.

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So again, it's just it's just strongs the fact that it was not added at all.

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OK, all right.

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So and the third assignment, we just deleted the solar cell out of the collection and now we do not

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have it.

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And anyone can recall if said collection before we go to the next assignment, which is which is copying.

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So that collection.

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All right.

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Copy said copy the.

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The drinks into a new SAT collection, so anyone remembers if a collection is an ordered or unordered

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collection and this is important for anyone to remember.

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All right.

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So if if you recall from previous lectures, we mentioned the differences between the collections and

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we mentioned that collection is an unordered collection, meaning it does not have indexes for its sales.

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So it's unordered and unindexed, it's not indexed.

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So once you try to copy it, let's see what happens.

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So you were asked to create rings to collection and copy from the existing one?

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Same as we did in list.

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If I recall, we already did this copy action.

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Right?

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So we did this like this.

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And let's try to print drinks to all print drinks to set collection.

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All right.

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And what do you think before you apply this action, can you tell me when you can you tell yourself

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to be more accurate and what would happen when we print it?

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All right.

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So here we see this order.

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We see color first and we're inspired then water.

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But as I just mentioned, the collection is an unordered and an index collection.

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So once I copy it, the important question should be, will it be copied with the same order?

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And to answer that question, you need to ask yourselves, is it an ordered collection or is it not?

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And we just said that it's not.

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So once we print it, let's see what happens.

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All right.

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As you can see here.

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All right.

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As you can see and as expected, it was not printed out in the order of what we had in the original

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drinks collection because it's an unordered list.

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So once we copy it, we're not we cannot be sure that the order will be saved.

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It's not going to be safe because it does not have indexes.

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So once you copy it in hell is going to break through like chaos because you cannot maintain order in

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a collection.

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So once you copy it, the order will be break braked.

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As you can see here, it's really important part because it's it's like when you tried to use when you

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tried to figure out which collection you want to use in your code, you have to take this in in consideration

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like you need the index or you don't need index, because sometimes you like to copy your collection

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and it's important for you to maintain the order, but sometimes it's not important for you.

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So in this case, if you use a copy of a collection, your order will be broken.

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It's very important.

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I'm trying to bring you to the A game.

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I'm trying to bring out the ninja developer out of you mentioning all these little comments that are

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very important.

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All right.

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It's like a simple, simple topic or it's just an additional collection.

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All right.

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So it doesn't it cannot contain duplicates and stuff.

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Yeah, but you have important, important things here that you might be asked in interviews.

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And furthermore, when you try when you start coding in your job, once you apply to an already accepted,

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you will try to choose a collection for your code, for a mission that you have.

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And you need to know these things because this is what differentiates medius mediocre from a ninja or

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these little things.

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So I'm trying to bring you all the little notes so you will become a professional by the end.

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All right.

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OK, so now let's go to the fifth assignment.

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So your fifth assignment was to print out.

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It was a bonus one, by the way.

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It was to print the length of the collection.

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And as I recall, I mentioned that you need to look it up online.

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So it was pretty it's pretty easy to find it.

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And I'm just going to give you the answer straight away.

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And you just need to you just need to look online how to print the length of a collection.

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And the first results will probably give you this, the following result, because you only have one

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result for this question.

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So look out for like look for the result right now.

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All right.

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So the length of the collection.

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Drinks is is on is, yeah, so what do you do?

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So, first of all, there is the key action guyland at the end like that, and then inside you put the

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collection that you want, the length of it be print it out.

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But now we have here, all right, here we have a integer and this is a string.

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So we have a problem.

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So we need to cover it with, uh, with a casting for strings.

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So we have string, you have length and you have drinks.

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All right, let's sprint, let's see what happens.

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OK, so we have four cells here.

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One is the copy one this one, one, two, three, four.

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If I recall, we already use the length and once we studied the lists.

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All right.

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So we use it already is just a reminder of how to do it.

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But again, all right.

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This is how you do it.

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Just put langue action and inside you put the lay of what you think of what you need to recall.

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And around it, you put the casting of string like that.

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So you have the number four here.

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And actually you have four cells here, one, two, three, four.

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So this one is also correct and this is about it.

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I think we covered everything that we need to know regarding said collections.

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Right.

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We practice it here and learn learned lot things.

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So we learned that once we add a cell that already exists inside the cell collection, it's not going

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to be added like the cold is going to just completely ignore of it.

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And after that, when we copied it and we tried to print out the copy, we have seen that chaos goes

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goes up because we cannot maintain order in an unindexed collection such such as set.

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So once we printed out the drinks, too, did not maintain the order.

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And last we had to print out the length of the collection and we saw that we printed out the number

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of items that we have successfully.

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All right.

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So this is about it.

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So in the next lecture, we will learn about tuple, which our fourth collection, fourth and last collection.

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And once we complete that part, we will be masters in collections and in interviews we can ask you

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we can be asked for everything.

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And I assure you that you will know all the answers.

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If you watched all the theory lectures and practiced all the assignments, I'm sure that you can answer

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every question that anyone would ask you.

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And that's about it for this lecture.

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See you in the next video regarding Topal.

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Thank you and bye bye.